diff --git a/examples/src/bin/custom_meta.rs b/examples/src/bin/custom_meta.rs
index 904a83cd0..f25c32e3c 100644
--- a/examples/src/bin/custom_meta.rs
+++ b/examples/src/bin/custom_meta.rs
@@ -16,7 +16,7 @@ mod custom_meta {
     use std::ptr;
 
     // Public Rust type for the custom meta.
-    #[repr(C)]
+    #[repr(transparent)]
     pub struct CustomMeta(imp::CustomMeta);
 
     // Metas must be Send+Sync.
diff --git a/examples/src/examples-common.rs b/examples/src/examples-common.rs
index f22be66f2..353adb4c9 100644
--- a/examples/src/examples-common.rs
+++ b/examples/src/examples-common.rs
@@ -4,7 +4,6 @@
 #[cfg(target_os = "macos")]
 mod runloop {
     use std::os::raw::c_void;
-    #[repr(C)]
     pub struct CFRunLoop(*mut c_void);
 
     #[link(name = "foundation", kind = "framework")]
diff --git a/gstreamer-audio/src/audio_meta.rs b/gstreamer-audio/src/audio_meta.rs
index c3cd58837..1e73a6b60 100644
--- a/gstreamer-audio/src/audio_meta.rs
+++ b/gstreamer-audio/src/audio_meta.rs
@@ -21,7 +21,7 @@ use gst;
 use gst::prelude::*;
 use gst_audio_sys;
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct AudioClippingMeta(gst_audio_sys::GstAudioClippingMeta);
 
 unsafe impl Send for AudioClippingMeta {}
@@ -76,7 +76,7 @@ impl fmt::Debug for AudioClippingMeta {
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
-#[repr(C)]
+#[repr(transparent)]
 pub struct AudioMeta(gst_audio_sys::GstAudioMeta);
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
diff --git a/gstreamer-audio/src/audio_ring_buffer_spec.rs b/gstreamer-audio/src/audio_ring_buffer_spec.rs
index 47f7ebbbd..e1e3a7509 100644
--- a/gstreamer-audio/src/audio_ring_buffer_spec.rs
+++ b/gstreamer-audio/src/audio_ring_buffer_spec.rs
@@ -7,7 +7,7 @@ use AudioRingBufferFormatType;
 
 use std::fmt;
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct AudioRingBufferSpec(pub(crate) GstAudioRingBufferSpec);
 
 impl AudioRingBufferSpec {
diff --git a/gstreamer-gl/src/gl_sync_meta.rs b/gstreamer-gl/src/gl_sync_meta.rs
index f491b1d18..1302f6018 100644
--- a/gstreamer-gl/src/gl_sync_meta.rs
+++ b/gstreamer-gl/src/gl_sync_meta.rs
@@ -8,7 +8,7 @@ use gst_gl_sys;
 
 use GLContext;
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct GLSyncMeta(gst_gl_sys::GstGLSyncMeta);
 
 unsafe impl Send for GLSyncMeta {}
diff --git a/gstreamer-net/src/net_address_meta.rs b/gstreamer-net/src/net_address_meta.rs
index c0ff92164..ffd22144d 100644
--- a/gstreamer-net/src/net_address_meta.rs
+++ b/gstreamer-net/src/net_address_meta.rs
@@ -7,7 +7,7 @@ use gst;
 use gst::prelude::*;
 use gst_net_sys;
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct NetAddressMeta(gst_net_sys::GstNetAddressMeta);
 
 unsafe impl Send for NetAddressMeta {}
diff --git a/gstreamer-sdp/src/sdp_attribute.rs b/gstreamer-sdp/src/sdp_attribute.rs
index af78855cf..8f16cb0a8 100644
--- a/gstreamer-sdp/src/sdp_attribute.rs
+++ b/gstreamer-sdp/src/sdp_attribute.rs
@@ -13,7 +13,7 @@ use std::mem;
 use glib::translate::*;
 use gst_sdp_sys;
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct SDPAttribute(pub(crate) gst_sdp_sys::GstSDPAttribute);
 
 unsafe impl Send for SDPAttribute {}
diff --git a/gstreamer-sdp/src/sdp_bandwidth.rs b/gstreamer-sdp/src/sdp_bandwidth.rs
index f1e97c43d..699217362 100644
--- a/gstreamer-sdp/src/sdp_bandwidth.rs
+++ b/gstreamer-sdp/src/sdp_bandwidth.rs
@@ -13,7 +13,7 @@ use std::mem;
 use glib::translate::*;
 use gst_sdp_sys;
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct SDPBandwidth(pub(crate) gst_sdp_sys::GstSDPBandwidth);
 
 unsafe impl Send for SDPBandwidth {}
diff --git a/gstreamer-sdp/src/sdp_connection.rs b/gstreamer-sdp/src/sdp_connection.rs
index 55eacae42..2f20b3c43 100644
--- a/gstreamer-sdp/src/sdp_connection.rs
+++ b/gstreamer-sdp/src/sdp_connection.rs
@@ -13,7 +13,7 @@ use std::mem;
 use glib::translate::*;
 use gst_sdp_sys;
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct SDPConnection(pub(crate) gst_sdp_sys::GstSDPConnection);
 
 unsafe impl Send for SDPConnection {}
diff --git a/gstreamer-sdp/src/sdp_key.rs b/gstreamer-sdp/src/sdp_key.rs
index 737120fe6..ed717a4ec 100644
--- a/gstreamer-sdp/src/sdp_key.rs
+++ b/gstreamer-sdp/src/sdp_key.rs
@@ -11,7 +11,7 @@ use std::fmt;
 
 use gst_sdp_sys;
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct SDPKey(gst_sdp_sys::GstSDPKey);
 
 unsafe impl Send for SDPKey {}
diff --git a/gstreamer-sdp/src/sdp_media.rs b/gstreamer-sdp/src/sdp_media.rs
index c8200d976..89fc567fe 100644
--- a/gstreamer-sdp/src/sdp_media.rs
+++ b/gstreamer-sdp/src/sdp_media.rs
@@ -85,7 +85,7 @@ impl fmt::Display for SDPMedia {
     }
 }
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct SDPMediaRef(gst_sdp_sys::GstSDPMedia);
 
 impl fmt::Debug for SDPMediaRef {
diff --git a/gstreamer-sdp/src/sdp_message.rs b/gstreamer-sdp/src/sdp_message.rs
index d8a2b20fb..cbc88472c 100644
--- a/gstreamer-sdp/src/sdp_message.rs
+++ b/gstreamer-sdp/src/sdp_message.rs
@@ -119,7 +119,7 @@ impl SDPMessage {
     }
 }
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct SDPMessageRef(gst_sdp_sys::GstSDPMessage);
 
 impl fmt::Debug for SDPMessageRef {
diff --git a/gstreamer-sdp/src/sdp_origin.rs b/gstreamer-sdp/src/sdp_origin.rs
index d016eb525..30c698715 100644
--- a/gstreamer-sdp/src/sdp_origin.rs
+++ b/gstreamer-sdp/src/sdp_origin.rs
@@ -11,7 +11,7 @@ use std::fmt;
 
 use gst_sdp_sys;
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct SDPOrigin(pub(crate) gst_sdp_sys::GstSDPOrigin);
 
 unsafe impl Send for SDPOrigin {}
diff --git a/gstreamer-sdp/src/sdp_time.rs b/gstreamer-sdp/src/sdp_time.rs
index 5fc5d436f..41fad78de 100644
--- a/gstreamer-sdp/src/sdp_time.rs
+++ b/gstreamer-sdp/src/sdp_time.rs
@@ -15,7 +15,7 @@ use std::ptr;
 use glib::translate::*;
 use gst_sdp_sys;
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct SDPTime(pub(crate) gst_sdp_sys::GstSDPTime);
 
 unsafe impl Send for SDPTime {}
diff --git a/gstreamer-sdp/src/sdp_zone.rs b/gstreamer-sdp/src/sdp_zone.rs
index 8868058df..5f6c9b14a 100644
--- a/gstreamer-sdp/src/sdp_zone.rs
+++ b/gstreamer-sdp/src/sdp_zone.rs
@@ -13,7 +13,7 @@ use std::mem;
 use glib::translate::*;
 use gst_sdp_sys;
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct SDPZone(pub(crate) gst_sdp_sys::GstSDPZone);
 
 unsafe impl Send for SDPZone {}
diff --git a/gstreamer-video/src/video_meta.rs b/gstreamer-video/src/video_meta.rs
index b728a2d43..be3dfa866 100644
--- a/gstreamer-video/src/video_meta.rs
+++ b/gstreamer-video/src/video_meta.rs
@@ -16,7 +16,7 @@ use gst::prelude::*;
 use gst_sys;
 use gst_video_sys;
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct VideoMeta(gst_video_sys::GstVideoMeta);
 
 unsafe impl Send for VideoMeta {}
@@ -176,7 +176,7 @@ impl fmt::Debug for VideoMeta {
     }
 }
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct VideoCropMeta(gst_video_sys::GstVideoCropMeta);
 
 unsafe impl Send for VideoCropMeta {}
@@ -235,7 +235,7 @@ impl fmt::Debug for VideoCropMeta {
     }
 }
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct VideoRegionOfInterestMeta(gst_video_sys::GstVideoRegionOfInterestMeta);
 
 unsafe impl Send for VideoRegionOfInterestMeta {}
@@ -367,7 +367,7 @@ impl fmt::Debug for VideoRegionOfInterestMeta {
     }
 }
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct VideoAffineTransformationMeta(gst_video_sys::GstVideoAffineTransformationMeta);
 
 unsafe impl Send for VideoAffineTransformationMeta {}
@@ -426,7 +426,7 @@ impl fmt::Debug for VideoAffineTransformationMeta {
     }
 }
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct VideoOverlayCompositionMeta(gst_video_sys::GstVideoOverlayCompositionMeta);
 
 unsafe impl Send for VideoOverlayCompositionMeta {}
@@ -482,7 +482,7 @@ impl fmt::Debug for VideoOverlayCompositionMeta {
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
-#[repr(C)]
+#[repr(transparent)]
 pub struct VideoCaptionMeta(gst_video_sys::GstVideoCaptionMeta);
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
@@ -544,7 +544,7 @@ impl fmt::Debug for VideoCaptionMeta {
 }
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
-#[repr(C)]
+#[repr(transparent)]
 pub struct VideoAFDMeta(gst_video_sys::GstVideoAFDMeta);
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
@@ -608,7 +608,7 @@ impl fmt::Debug for VideoAFDMeta {
 }
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
-#[repr(C)]
+#[repr(transparent)]
 pub struct VideoBarMeta(gst_video_sys::GstVideoBarMeta);
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
diff --git a/gstreamer-video/src/video_time_code.rs b/gstreamer-video/src/video_time_code.rs
index c037982cd..bf447ecdd 100644
--- a/gstreamer-video/src/video_time_code.rs
+++ b/gstreamer-video/src/video_time_code.rs
@@ -525,7 +525,7 @@ impl From<ValidVideoTimeCode> for VideoTimeCode {
     }
 }
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct VideoTimeCodeMeta(gst_video_sys::GstVideoTimeCodeMeta);
 
 unsafe impl Send for VideoTimeCodeMeta {}
diff --git a/gstreamer/src/caps_features.rs b/gstreamer/src/caps_features.rs
index 1ee2488f7..f3898312a 100644
--- a/gstreamer/src/caps_features.rs
+++ b/gstreamer/src/caps_features.rs
@@ -251,7 +251,7 @@ impl GlibPtrDefault for CapsFeatures {
     type GlibType = *mut gst_sys::GstCapsFeatures;
 }
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct CapsFeaturesRef(gst_sys::GstCapsFeatures);
 
 impl CapsFeaturesRef {
diff --git a/gstreamer/src/clock.rs b/gstreamer/src/clock.rs
index 79afb9767..a2bd02502 100644
--- a/gstreamer/src/clock.rs
+++ b/gstreamer/src/clock.rs
@@ -309,7 +309,7 @@ impl PeriodicClockId {
     }
 }
 
-#[repr(C)]
+#[repr(transparent)]
 #[derive(Debug)]
 pub struct AtomicClockReturn(AtomicI32);
 
diff --git a/gstreamer/src/meta.rs b/gstreamer/src/meta.rs
index 1363a2620..877043aa7 100644
--- a/gstreamer/src/meta.rs
+++ b/gstreamer/src/meta.rs
@@ -227,7 +227,7 @@ impl<'a, U> MetaRefMut<'a, Meta, U> {
     }
 }
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct Meta(gst_sys::GstMeta);
 
 unsafe impl Send for Meta {}
@@ -255,7 +255,7 @@ impl fmt::Debug for Meta {
     }
 }
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct ParentBufferMeta(gst_sys::GstParentBufferMeta);
 
 unsafe impl Send for ParentBufferMeta {}
@@ -299,7 +299,7 @@ impl fmt::Debug for ParentBufferMeta {
     }
 }
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct ProtectionMeta(gst_sys::GstProtectionMeta);
 
 unsafe impl Send for ProtectionMeta {}
@@ -342,7 +342,7 @@ impl fmt::Debug for ProtectionMeta {
 }
 
 #[cfg(any(feature = "v1_14", feature = "dox"))]
-#[repr(C)]
+#[repr(transparent)]
 pub struct ReferenceTimestampMeta(gst_sys::GstReferenceTimestampMeta);
 
 #[cfg(any(feature = "v1_14", feature = "dox"))]
diff --git a/gstreamer/src/miniobject.rs b/gstreamer/src/miniobject.rs
index decef0252..99a2f88cd 100644
--- a/gstreamer/src/miniobject.rs
+++ b/gstreamer/src/miniobject.rs
@@ -13,7 +13,7 @@ macro_rules! gst_define_mini_object_wrapper(
             obj: ::std::ptr::NonNull<$ref_name>,
         }
 
-        #[repr(C)]
+        #[repr(transparent)]
         pub struct $ref_name($gst_sys_name);
 
         impl $name {
diff --git a/gstreamer/src/segment.rs b/gstreamer/src/segment.rs
index 1e9f39ae6..66becac06 100644
--- a/gstreamer/src/segment.rs
+++ b/gstreamer/src/segment.rs
@@ -22,7 +22,7 @@ use SeekFlags;
 use SeekType;
 
 pub type Segment = FormattedSegment<GenericFormattedValue>;
-#[repr(C)]
+#[repr(transparent)]
 pub struct FormattedSegment<T: FormattedValue>(gst_sys::GstSegment, PhantomData<T>);
 
 impl Segment {
diff --git a/gstreamer/src/static_caps.rs b/gstreamer/src/static_caps.rs
index b874dfbac..49f3b789e 100644
--- a/gstreamer/src/static_caps.rs
+++ b/gstreamer/src/static_caps.rs
@@ -19,7 +19,6 @@ use std::ffi::CStr;
 use std::fmt;
 use std::ptr;
 
-#[repr(C)]
 pub struct StaticCaps(ptr::NonNull<gst_sys::GstStaticCaps>);
 
 impl StaticCaps {
diff --git a/gstreamer/src/static_pad_template.rs b/gstreamer/src/static_pad_template.rs
index 2d25e8eeb..97e33532e 100644
--- a/gstreamer/src/static_pad_template.rs
+++ b/gstreamer/src/static_pad_template.rs
@@ -20,7 +20,6 @@ use std::ffi::CStr;
 use std::fmt;
 use std::ptr;
 
-#[repr(C)]
 pub struct StaticPadTemplate(ptr::NonNull<gst_sys::GstStaticPadTemplate>);
 
 impl StaticPadTemplate {
diff --git a/gstreamer/src/structure.rs b/gstreamer/src/structure.rs
index c2fd3def0..f9cf9d8fe 100644
--- a/gstreamer/src/structure.rs
+++ b/gstreamer/src/structure.rs
@@ -319,7 +319,7 @@ impl GlibPtrDefault for Structure {
     type GlibType = *mut gst_sys::GstStructure;
 }
 
-#[repr(C)]
+#[repr(transparent)]
 pub struct StructureRef(gst_sys::GstStructure);
 
 unsafe impl Send for StructureRef {}
diff --git a/gstreamer/src/subclass/plugin_1_12.rs b/gstreamer/src/subclass/plugin_1_12.rs
index 95ca24eff..0dfebf143 100644
--- a/gstreamer/src/subclass/plugin_1_12.rs
+++ b/gstreamer/src/subclass/plugin_1_12.rs
@@ -23,7 +23,7 @@ macro_rules! gst_plugin_define(
         pub mod plugin_desc {
             use $crate::glib::translate::{from_glib_borrow, ToGlib, from_glib};
 
-            #[repr(C)]
+            #[repr(transparent)]
             pub struct GstPluginDesc($crate::gst_sys::GstPluginDesc);
             unsafe impl Send for GstPluginDesc {}
             unsafe impl Sync for GstPluginDesc {}
diff --git a/gstreamer/src/subclass/plugin_1_14.rs b/gstreamer/src/subclass/plugin_1_14.rs
index 3aa95186f..539590c17 100644
--- a/gstreamer/src/subclass/plugin_1_14.rs
+++ b/gstreamer/src/subclass/plugin_1_14.rs
@@ -23,7 +23,7 @@ macro_rules! gst_plugin_define(
         pub mod plugin_desc {
             use $crate::glib::translate::{from_glib_borrow, ToGlib, from_glib};
 
-            #[repr(C)]
+            #[repr(transparent)]
             pub struct GstPluginDesc($crate::gst_sys::GstPluginDesc);
             unsafe impl Send for GstPluginDesc {}
             unsafe impl Sync for GstPluginDesc {}
diff --git a/gstreamer/src/typefind.rs b/gstreamer/src/typefind.rs
index 8a4f58de5..28028851b 100644
--- a/gstreamer/src/typefind.rs
+++ b/gstreamer/src/typefind.rs
@@ -19,7 +19,7 @@ use glib_sys;
 use std::ptr;
 use std::slice;
 
-#[repr(C)]
+#[repr(transparent)]
 #[derive(Debug)]
 pub struct TypeFind(gst_sys::GstTypeFind);
 
diff --git a/gstreamer/src/value_serde.rs b/gstreamer/src/value_serde.rs
index 5c0aac113..67f8313be 100644
--- a/gstreamer/src/value_serde.rs
+++ b/gstreamer/src/value_serde.rs
@@ -140,7 +140,7 @@ macro_rules! ser_value (
     );
 );
 
-#[repr(C)]
+#[repr(transparent)]
 pub(crate) struct SendValue(glib::SendValue);
 impl SendValue {
     pub(crate) fn from(send_value: glib::SendValue) -> Self {
diff --git a/tutorials/src/tutorials-common.rs b/tutorials/src/tutorials-common.rs
index f22be66f2..353adb4c9 100644
--- a/tutorials/src/tutorials-common.rs
+++ b/tutorials/src/tutorials-common.rs
@@ -4,7 +4,6 @@
 #[cfg(target_os = "macos")]
 mod runloop {
     use std::os::raw::c_void;
-    #[repr(C)]
     pub struct CFRunLoop(*mut c_void);
 
     #[link(name = "foundation", kind = "framework")]