diff --git a/dom/base/Console.cpp b/dom/base/Console.cpp
index c0e13683e8da..0ca30f4491c0 100644
--- a/dom/base/Console.cpp
+++ b/dom/base/Console.cpp
@@ -906,7 +906,7 @@ public:
     }
   }
 
-  virtual bool Equals(const TimelineMarker* aOther)
+  virtual bool Equals(const TimelineMarker* aOther) MOZ_OVERRIDE
   {
     if (!TimelineMarker::Equals(aOther)) {
       return false;
@@ -915,7 +915,7 @@ public:
     return GetCause() == aOther->GetCause();
   }
 
-  virtual void AddDetails(mozilla::dom::ProfileTimelineMarker& aMarker)
+  virtual void AddDetails(mozilla::dom::ProfileTimelineMarker& aMarker) MOZ_OVERRIDE
   {
     if (GetMetaData() == TRACING_INTERVAL_START) {
       aMarker.mCauseName.Construct(GetCause());
diff --git a/dom/events/EventListenerManager.cpp b/dom/events/EventListenerManager.cpp
index 2af42d474ad6..b2add5f0d785 100644
--- a/dom/events/EventListenerManager.cpp
+++ b/dom/events/EventListenerManager.cpp
@@ -1034,7 +1034,7 @@ public:
   {
   }
 
-  virtual void AddDetails(mozilla::dom::ProfileTimelineMarker& aMarker)
+  virtual void AddDetails(mozilla::dom::ProfileTimelineMarker& aMarker) MOZ_OVERRIDE
   {
     if (GetMetaData() == TRACING_INTERVAL_START) {
       aMarker.mType.Construct(GetCause());
diff --git a/layout/base/FrameLayerBuilder.cpp b/layout/base/FrameLayerBuilder.cpp
index b1ed38498adf..81e44fee2da6 100644
--- a/layout/base/FrameLayerBuilder.cpp
+++ b/layout/base/FrameLayerBuilder.cpp
@@ -4526,7 +4526,7 @@ public:
   {
   }
 
-  virtual void AddLayerRectangles(mozilla::dom::Sequence<mozilla::dom::ProfileTimelineLayerRect>& aRectangles)
+  virtual void AddLayerRectangles(mozilla::dom::Sequence<mozilla::dom::ProfileTimelineLayerRect>& aRectangles) MOZ_OVERRIDE
   {
     nsIntRegionRectIterator it(mRegion);
     while (const nsIntRect* iterRect = it.Next()) {