--- a/layout/style/nsStyleSet.cpp
+++ b/layout/style/nsStyleSet.cpp
@@ -13,16 +13,17 @@
 
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/CSSStyleSheet.h"
 #include "mozilla/EffectCompositor.h"
 #include "mozilla/EnumeratedRange.h"
 #include "mozilla/EventStates.h"
 #include "mozilla/MemoryReporting.h"
 #include "mozilla/RuleProcessorCache.h"
+#include "mozilla/StyleSheetHandleInlines.h"
 #include "nsIDocumentInlines.h"
 #include "nsRuleWalker.h"
 #include "nsStyleContext.h"
 #include "mozilla/css/StyleRule.h"
 #include "nsCSSAnonBoxes.h"
 #include "nsCSSPseudoElements.h"
 #include "nsCSSRuleProcessor.h"
 #include "nsDataHashtable.h"