diff --git a/dom/animation/KeyframeEffect.h b/dom/animation/KeyframeEffect.h
index 98e19da36ce4..52c2c56cad98 100644
--- a/dom/animation/KeyframeEffect.h
+++ b/dom/animation/KeyframeEffect.h
@@ -11,7 +11,6 @@
 #include "nsCSSProperty.h"
 #include "nsCSSValue.h"
 #include "nsCycleCollectionParticipant.h"
-#include "nsIDocument.h"
 #include "nsTArray.h"
 #include "nsWrapperCache.h"
 #include "mozilla/AnimationPerformanceWarning.h"
diff --git a/layout/base/MobileViewportManager.cpp b/layout/base/MobileViewportManager.cpp
index 1a3613429007..568767c876ac 100644
--- a/layout/base/MobileViewportManager.cpp
+++ b/layout/base/MobileViewportManager.cpp
@@ -14,6 +14,7 @@
 #include "nsViewManager.h"
 #include "nsViewportInfo.h"
 #include "UnitTransforms.h"
+#include "nsIDocument.h"
 
 #define MVM_LOG(...)
 // #define MVM_LOG(...) printf_stderr("MVM: " __VA_ARGS__)
diff --git a/layout/base/MobileViewportManager.h b/layout/base/MobileViewportManager.h
index 97255298a614..ce9aab99367b 100644
--- a/layout/base/MobileViewportManager.h
+++ b/layout/base/MobileViewportManager.h
@@ -8,7 +8,6 @@
 
 #include "mozilla/Maybe.h"
 #include "nsIDOMEventListener.h"
-#include "nsIDocument.h"
 #include "nsIObserver.h"
 #include "Units.h"
 
diff --git a/layout/base/ZoomConstraintsClient.h b/layout/base/ZoomConstraintsClient.h
index 4a2da9114e21..128ed73eae90 100644
--- a/layout/base/ZoomConstraintsClient.h
+++ b/layout/base/ZoomConstraintsClient.h
@@ -9,7 +9,6 @@
 #include "FrameMetrics.h"
 #include "mozilla/Maybe.h"
 #include "nsIDOMEventListener.h"
-#include "nsIDocument.h"
 #include "nsIObserver.h"
 #include "nsWeakPtr.h"
 
diff --git a/layout/base/nsCSSFrameConstructor.h b/layout/base/nsCSSFrameConstructor.h
index 1b2696e99e99..893ce8666ea3 100644
--- a/layout/base/nsCSSFrameConstructor.h
+++ b/layout/base/nsCSSFrameConstructor.h
@@ -20,7 +20,6 @@
 #include "nsCounterManager.h"
 #include "nsIAnonymousContentCreator.h"
 #include "nsFrameManager.h"
-#include "nsIDocument.h"
 #include "ScrollbarStyles.h"
 
 struct nsFrameItems;
@@ -31,6 +30,7 @@ struct nsGenConInitializer;
 class nsContainerFrame;
 class nsFirstLineFrame;
 class nsICSSAnonBoxPseudo;
+class nsIDocument;
 class nsPageContentFrame;
 struct PendingBinding;
 class nsGenericDOMDataNode;