diff --git a/layout/mathml/base/src/nsMathMLmiFrame.cpp b/layout/mathml/base/src/nsMathMLmiFrame.cpp
index 82b56ca8803..7495dd9261f 100644
--- a/layout/mathml/base/src/nsMathMLmiFrame.cpp
+++ b/layout/mathml/base/src/nsMathMLmiFrame.cpp
@@ -31,7 +31,6 @@
 #include "nsUnitConversion.h"
 #include "nsIStyleContext.h"
 #include "nsStyleConsts.h"
-#include "nsStyleChangeList.h"
 #include "nsINameSpaceManager.h"
 #include "nsIRenderingContext.h"
 #include "nsIFontMetrics.h"
diff --git a/layout/mathml/base/src/nsMathMLmtextFrame.cpp b/layout/mathml/base/src/nsMathMLmtextFrame.cpp
index bcde5eff367..af8db7e8dae 100644
--- a/layout/mathml/base/src/nsMathMLmtextFrame.cpp
+++ b/layout/mathml/base/src/nsMathMLmtextFrame.cpp
@@ -30,7 +30,6 @@
 #include "nsUnitConversion.h"
 #include "nsIStyleContext.h"
 #include "nsStyleConsts.h"
-#include "nsStyleChangeList.h"
 #include "nsINameSpaceManager.h"
 #include "nsIRenderingContext.h"
 #include "nsIFontMetrics.h"