diff --git a/gstreamer/src/child_proxy.rs b/gstreamer/src/child_proxy.rs
index d48d561f4..96bdde989 100644
--- a/gstreamer/src/child_proxy.rs
+++ b/gstreamer/src/child_proxy.rs
@@ -8,10 +8,10 @@ use std::ptr;
 pub trait ChildProxyExtManual: 'static {
     #[doc(alias = "get_child_property")]
     fn child_property(&self, name: &str) -> Option<glib::Value>;
-    fn set_child_property(
+    fn set_child_property<V: glib::ToValue>(
         &self,
         name: &str,
-        value: &dyn glib::ToValue,
+        value: V,
     ) -> Result<(), glib::BoolError>;
 }
 
@@ -38,10 +38,10 @@ impl<O: IsA<ChildProxy>> ChildProxyExtManual for O {
         }
     }
 
-    fn set_child_property(
+    fn set_child_property<V: glib::ToValue>(
         &self,
         name: &str,
-        value: &dyn glib::ToValue,
+        value: V,
     ) -> Result<(), glib::BoolError> {
         unsafe {
             let found: bool = from_glib(ffi::gst_child_proxy_lookup(