diff --git a/gstreamer-app/src/app_sink.rs b/gstreamer-app/src/app_sink.rs
index c75d17c87..ee7f363bb 100644
--- a/gstreamer-app/src/app_sink.rs
+++ b/gstreamer-app/src/app_sink.rs
@@ -17,6 +17,7 @@ use gst_app_sys;
 use gst_sys;
 use std::boxed::Box as Box_;
 use std::cell::RefCell;
+use std::mem::transmute;
 use std::panic;
 use std::ptr;
 use std::sync::atomic::{AtomicBool, Ordering};
@@ -294,7 +295,9 @@ impl AppSink {
             connect_raw(
                 self.as_ptr() as *mut _,
                 b"new-sample\0".as_ptr() as *const _,
-                Some(*(&new_sample_trampoline::<F> as *const _ as *const _)),
+                Some(transmute::<_, unsafe extern "C" fn()>(
+                    new_sample_trampoline::<F> as *const (),
+                )),
                 Box_::into_raw(f),
             )
         }
@@ -311,7 +314,9 @@ impl AppSink {
             connect_raw(
                 self.as_ptr() as *mut _,
                 b"new-preroll\0".as_ptr() as *const _,
-                Some(*(&new_preroll_trampoline::<F> as *const _ as *const _)),
+                Some(transmute::<_, unsafe extern "C" fn()>(
+                    new_preroll_trampoline::<F> as *const (),
+                )),
                 Box_::into_raw(f),
             )
         }
diff --git a/gstreamer-base/src/aggregator.rs b/gstreamer-base/src/aggregator.rs
index 66aa4fa74..2b5643df9 100644
--- a/gstreamer-base/src/aggregator.rs
+++ b/gstreamer-base/src/aggregator.rs
@@ -19,6 +19,8 @@ use gst_base_sys;
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 use std::boxed::Box as Box_;
 use std::mem;
+#[cfg(any(feature = "v1_16", feature = "dox"))]
+use std::mem::transmute;
 use std::ptr;
 use Aggregator;
 
@@ -100,7 +102,9 @@ impl<O: IsA<Aggregator>> AggregatorExtManual for O {
             connect_raw(
                 self.as_ptr() as *mut _,
                 b"notify::min-upstream-latency\0".as_ptr() as *const _,
-                Some(*(&notify_min_upstream_latency_trampoline::<Self, F> as *const _ as *const _)),
+                Some(transmute::<_, unsafe extern "C" fn()>(
+                    notify_min_upstream_latency_trampoline::<Self, F> as *const (),
+                )),
                 Box_::into_raw(f),
             )
         }
diff --git a/gstreamer-pbutils/src/discoverer.rs b/gstreamer-pbutils/src/discoverer.rs
index acb9c947e..4737c8738 100644
--- a/gstreamer-pbutils/src/discoverer.rs
+++ b/gstreamer-pbutils/src/discoverer.rs
@@ -23,6 +23,7 @@ use gobject_sys;
 use gst_pbutils_sys;
 
 use std::boxed::Box as Box_;
+use std::mem::transmute;
 
 impl Discoverer {
     pub fn set_property_timeout(&self, timeout: gst::ClockTime) {
@@ -59,7 +60,9 @@ impl Discoverer {
             connect_raw(
                 self.as_ptr() as *mut _,
                 b"notify::timeout\0".as_ptr() as *const _,
-                Some(*(&notify_timeout_trampoline::<Self, F> as *const _ as *const _)),
+                Some(transmute::<_, unsafe extern "C" fn()>(
+                    notify_timeout_trampoline::<Self, F> as *const (),
+                )),
                 Box_::into_raw(f),
             )
         }
diff --git a/gstreamer-player/src/player.rs b/gstreamer-player/src/player.rs
index d6587c511..d9ba4f2e0 100644
--- a/gstreamer-player/src/player.rs
+++ b/gstreamer-player/src/player.rs
@@ -15,6 +15,7 @@ use glib_sys;
 use gst;
 use gst_player_sys;
 use std::boxed::Box as Box_;
+use std::mem::transmute;
 use Player;
 use PlayerSignalDispatcher;
 use PlayerVideoRenderer;
@@ -71,7 +72,9 @@ impl Player {
             connect_raw(
                 self.as_ptr() as *mut _,
                 b"duration-changed\0".as_ptr() as *const _,
-                Some(*(&duration_changed_trampoline::<F> as *const _ as *const _)),
+                Some(transmute::<_, unsafe extern "C" fn()>(
+                    duration_changed_trampoline::<F> as *const (),
+                )),
                 Box_::into_raw(f),
             )
         }
@@ -87,7 +90,9 @@ impl Player {
             connect_raw(
                 self.as_ptr() as *mut _,
                 b"position-updated\0".as_ptr() as *const _,
-                Some(*(&position_updated_trampoline::<F> as *const _ as *const _)),
+                Some(transmute::<_, unsafe extern "C" fn()>(
+                    position_updated_trampoline::<F> as *const (),
+                )),
                 Box_::into_raw(f),
             )
         }
@@ -103,7 +108,9 @@ impl Player {
             connect_raw(
                 self.as_ptr() as *mut _,
                 b"seek-done\0".as_ptr() as *const _,
-                Some(*(&seek_done_trampoline::<F> as *const _ as *const _)),
+                Some(transmute::<_, unsafe extern "C" fn()>(
+                    seek_done_trampoline::<F> as *const (),
+                )),
                 Box_::into_raw(f),
             )
         }
diff --git a/gstreamer-rtsp-server/src/rtsp_auth.rs b/gstreamer-rtsp-server/src/rtsp_auth.rs
index 100c67bac..2503e3319 100644
--- a/gstreamer-rtsp-server/src/rtsp_auth.rs
+++ b/gstreamer-rtsp-server/src/rtsp_auth.rs
@@ -6,6 +6,7 @@ use glib::translate::*;
 use gst_rtsp_server_sys;
 
 use std::boxed::Box as Box_;
+use std::mem::transmute;
 
 use RTSPAuth;
 use RTSPToken;
@@ -58,7 +59,9 @@ impl<O: IsA<RTSPAuth>> RTSPAuthExtManual for O {
             connect_raw(
                 self.as_ptr() as *mut _,
                 b"accept-certificate\0".as_ptr() as *const _,
-                Some(*(&accept_certificate_trampoline::<Self, F> as *const _ as *const _)),
+                Some(transmute::<_, unsafe extern "C" fn()>(
+                    accept_certificate_trampoline::<Self, F> as *const (),
+                )),
                 Box_::into_raw(f),
             )
         }
diff --git a/gstreamer-rtsp-server/src/rtsp_session_pool.rs b/gstreamer-rtsp-server/src/rtsp_session_pool.rs
index d51d23e23..e8555b080 100644
--- a/gstreamer-rtsp-server/src/rtsp_session_pool.rs
+++ b/gstreamer-rtsp-server/src/rtsp_session_pool.rs
@@ -6,6 +6,7 @@ use glib_sys;
 use glib_sys::{gboolean, gpointer};
 use gst_rtsp_server_sys;
 use std::cell::RefCell;
+use std::mem::transmute;
 use RTSPSessionPool;
 
 unsafe extern "C" fn trampoline_watch<F: FnMut(&RTSPSessionPool) -> Continue + Send + 'static>(
@@ -48,7 +49,10 @@ impl<O: IsA<RTSPSessionPool>> RTSPSessionPoolExtManual for O {
             );
             glib_sys::g_source_set_callback(
                 source,
-                Some(*(&trampoline_watch::<F> as *const _ as *const _)),
+                Some(transmute::<
+                    _,
+                    unsafe extern "C" fn(glib_sys::gpointer) -> i32,
+                >(trampoline_watch::<F> as *const ())),
                 into_raw_watch(func),
                 Some(destroy_closure_watch::<F>),
             );
diff --git a/gstreamer-rtsp-server/src/subclass/rtsp_media_factory.rs b/gstreamer-rtsp-server/src/subclass/rtsp_media_factory.rs
index b2de19d70..dc7e2a738 100644
--- a/gstreamer-rtsp-server/src/subclass/rtsp_media_factory.rs
+++ b/gstreamer-rtsp-server/src/subclass/rtsp_media_factory.rs
@@ -16,6 +16,8 @@ use glib::subclass::prelude::*;
 use RTSPMediaFactory;
 use RTSPMediaFactoryClass;
 
+use std::mem::transmute;
+
 pub trait RTSPMediaFactoryImpl:
     RTSPMediaFactoryImplExt + ObjectImpl + Send + Sync + 'static
 {
@@ -290,7 +292,9 @@ where
         media as *mut _,
         PIPELINE_QUARK.to_glib(),
         pipeline as *mut _,
-        Some(*(&gobject_sys::g_object_unref as *const _ as *const _)),
+        Some(transmute::<_, unsafe extern "C" fn(glib_sys::gpointer)>(
+            gobject_sys::g_object_unref as *const (),
+        )),
     );
 
     pipeline as *mut _
diff --git a/gstreamer/src/bin.rs b/gstreamer/src/bin.rs
index 1406e7cce..ab97e95ca 100644
--- a/gstreamer/src/bin.rs
+++ b/gstreamer/src/bin.rs
@@ -22,6 +22,7 @@ use glib::GString;
 use gst_sys;
 
 use std::boxed::Box as Box_;
+use std::mem::transmute;
 use std::path;
 
 pub trait GstBinExtManual: 'static {
@@ -98,7 +99,9 @@ impl<O: IsA<Bin>> GstBinExtManual for O {
             connect_raw(
                 self.as_ptr() as *mut _,
                 b"do-latency\0".as_ptr() as *const _,
-                Some(*(&do_latency_trampoline::<Self, F> as *const _ as *const _)),
+                Some(transmute::<_, unsafe extern "C" fn()>(
+                    do_latency_trampoline::<Self, F> as *const (),
+                )),
                 Box_::into_raw(f),
             )
         }
diff --git a/gstreamer/src/bus.rs b/gstreamer/src/bus.rs
index 1a17a5cb9..9fdbb80ea 100644
--- a/gstreamer/src/bus.rs
+++ b/gstreamer/src/bus.rs
@@ -16,6 +16,7 @@ use glib_sys;
 use glib_sys::{gboolean, gpointer};
 use gst_sys;
 use std::cell::RefCell;
+use std::mem::transmute;
 use std::pin::Pin;
 use std::task::{Context, Poll};
 
@@ -93,7 +94,10 @@ impl Bus {
             let source = gst_sys::gst_bus_create_watch(self.to_glib_none().0);
             glib_sys::g_source_set_callback(
                 source,
-                Some(*(&trampoline_watch::<F> as *const _ as *const _)),
+                Some(transmute::<
+                    _,
+                    unsafe extern "C" fn(glib_sys::gpointer) -> i32,
+                >(trampoline_watch::<F> as *const ())),
                 into_raw_watch(func),
                 Some(destroy_closure_watch::<F>),
             );