diff --git a/gstreamer-app/src/app_sink.rs b/gstreamer-app/src/app_sink.rs
index 374524017..0e5ff59b4 100644
--- a/gstreamer-app/src/app_sink.rs
+++ b/gstreamer-app/src/app_sink.rs
@@ -22,6 +22,9 @@ pub struct AppSinkCallbacks {
     callbacks: ffi::GstAppSinkCallbacks,
 }
 
+unsafe impl Send for AppSinkCallbacks {}
+unsafe impl Sync for AppSinkCallbacks {}
+
 impl AppSinkCallbacks {
     pub fn new() -> AppSinkCallbacksBuilder {
         skip_assert_initialized!();
diff --git a/gstreamer-app/src/app_src.rs b/gstreamer-app/src/app_src.rs
index 9a8f193b3..7600a9573 100644
--- a/gstreamer-app/src/app_src.rs
+++ b/gstreamer-app/src/app_src.rs
@@ -22,6 +22,9 @@ pub struct AppSrcCallbacks {
     callbacks: ffi::GstAppSrcCallbacks,
 }
 
+unsafe impl Send for AppSrcCallbacks {}
+unsafe impl Sync for AppSrcCallbacks {}
+
 impl AppSrcCallbacks {
     pub fn new() -> AppSrcCallbacksBuilder {
         skip_assert_initialized!();