diff --git a/ports/geckolib/glue.rs b/ports/geckolib/glue.rs
index 93918a1c997..d4e16a470e5 100644
--- a/ports/geckolib/glue.rs
+++ b/ports/geckolib/glue.rs
@@ -3609,6 +3609,20 @@ pub unsafe extern "C" fn Servo_DeclarationBlock_SetProperty(
     )
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn Servo_DeclarationBlock_SetPropertyToAnimationValue(
+    declarations: RawServoDeclarationBlockBorrowed,
+    animation_value: RawServoAnimationValueBorrowed,
+) -> bool {
+    write_locked_arc(declarations, |decls: &mut PropertyDeclarationBlock| {
+        decls.push(
+            AnimationValue::as_arc(&animation_value).uncompute(),
+            Importance::Normal,
+            DeclarationSource::CssOm,
+        )
+    })
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn Servo_DeclarationBlock_SetPropertyById(
     declarations: RawServoDeclarationBlockBorrowed,