diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
index 0425e7341322..639a55baa043 100644
--- a/Source/WebCore/ChangeLog
+++ b/Source/WebCore/ChangeLog
@@ -1,3 +1,12 @@
+2017-08-21  Adrian Perez de Castro  <aperez@igalia.com>
+
+        [GTK][WPE][GSTREAMER_GL] Overriden virtual function not marked “override” in MediaPlayerPrivateGStreamerBase.h
+        https://bugs.webkit.org/show_bug.cgi?id=175780
+
+        Reviewed by Konstantin Tokarev.
+
+        * platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.h: Add missing "override" qualifier.
+
 2017-08-18  Said Abou-Hallawa  <sabouhallawa@apple.com>
 
         Followup (r220289): RenderImageResourceStyleImage code clean up
diff --git a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.h b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.h
index b8c15cec9893..a780dee99038 100644
--- a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.h
+++ b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.h
@@ -149,7 +149,7 @@ class MediaPlayerPrivateGStreamerBase : public MediaPlayerPrivateInterface
 
 #if USE(TEXTURE_MAPPER_GL)
     void updateTexture(BitmapTextureGL&, GstVideoInfo&);
-    RefPtr<TextureMapperPlatformLayerProxy> proxy() const;
+    RefPtr<TextureMapperPlatformLayerProxy> proxy() const override;
     void swapBuffersIfNeeded() override;
     void pushTextureToCompositor();
 #endif