diff --git a/widget/gtk/nsWindow.cpp b/widget/gtk/nsWindow.cpp
index 5e05a73d25b3..5813695cfb40 100644
--- a/widget/gtk/nsWindow.cpp
+++ b/widget/gtk/nsWindow.cpp
@@ -4952,24 +4952,18 @@ void nsWindow::UpdateTopLevelOpaqueRegionWayland(bool aSubtractCorners) {
     return;
   }
 
-  // Set opaque region to toplevel window only in fullscreen mode.
-  bool fullScreen = mSizeState != nsSizeMode_Normal && !mIsTiled;
-  if (fullScreen) {
-    wl_region* region =
-        CreateOpaqueRegionWayland(x, y, width, height, aSubtractCorners);
-    wl_surface_set_opaque_region(surface, region);
-    wl_region_destroy(region);
-  } else {
-    wl_surface_set_opaque_region(surface, nullptr);
-  }
+  wl_region* region =
+      CreateOpaqueRegionWayland(x, y, width, height, aSubtractCorners);
+  wl_surface_set_opaque_region(surface, region);
+  wl_region_destroy(region);
 
-  // TODO -> create a function for it
   GdkWindow* window = gtk_widget_get_window(mShell);
   if (window) {
     gdk_window_invalidate_rect(window, &rect, false);
   }
-
-  moz_container_update_opaque_region(mContainer, aSubtractCorners, fullScreen);
+  // We don't set opaque region to mozContainer due to Bug 1615098.
+  // moz_container_update_opaque_region(mContainer, aSubtractCorners,
+  //                                    fullScreen);
 }
 #endif