diff --git a/layout/forms/nsTextControlFrame.h b/layout/forms/nsTextControlFrame.h
index c8d7a0fb8404..8b79050717c0 100644
--- a/layout/forms/nsTextControlFrame.h
+++ b/layout/forms/nsTextControlFrame.h
@@ -155,8 +155,8 @@ public:
 
 //==== NSISTATEFULFRAME
 
-  UniquePtr<PresState> SaveState() override;
-  NS_IMETHOD RestoreState(PresState* aState) override;
+  mozilla::UniquePtr<mozilla::PresState> SaveState() override;
+  NS_IMETHOD RestoreState(mozilla::PresState* aState) override;
 
 //=== END NSISTATEFULFRAME
 
diff --git a/layout/xul/nsSliderFrame.h b/layout/xul/nsSliderFrame.h
index 74505ca05b37..f41a7537949f 100644
--- a/layout/xul/nsSliderFrame.h
+++ b/layout/xul/nsSliderFrame.h
@@ -18,7 +18,7 @@
 class nsITimer;
 class nsSliderFrame;
 
-nsIFrame* NS_NewSliderFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSliderFrame(nsIPresShell* aPresShell, mozilla::ComputedStyle* aStyle);
 
 class nsSliderMediator final : public nsIDOMEventListener
 {