diff --git a/image/AnimationParams.h b/image/AnimationParams.h
index 916ba7e407..dc403a4e8e 100644
--- a/image/AnimationParams.h
+++ b/image/AnimationParams.h
@@ -43,3 +43,5 @@ struct AnimationParams
 
 } // namespace image
 } // namespace mozilla
+
+#endif // mozilla_image_AnimationParams_h