diff --git a/ports/geckolib/glue.rs b/ports/geckolib/glue.rs
index 8648acba07e..4d47ec460a4 100644
--- a/ports/geckolib/glue.rs
+++ b/ports/geckolib/glue.rs
@@ -318,6 +318,12 @@ pub extern "C" fn Servo_StyleSet_RemoveStyleSheet(raw_data: RawServoStyleSetBorr
     data.stylesheets_changed = true;
 }
 
+#[no_mangle]
+pub extern "C" fn Servo_StyleSet_NoteStyleSheetsChanged(raw_data: RawServoStyleSetBorrowed) {
+    let mut data = PerDocumentStyleData::from_ffi(raw_data).borrow_mut();
+    data.stylesheets_changed = true;
+}
+
 #[no_mangle]
 pub extern "C" fn Servo_StyleSheet_HasRules(raw_sheet: RawServoStyleSheetBorrowed) -> bool {
     !Stylesheet::as_arc(&raw_sheet).rules.read().0.is_empty()