diff --git a/layout/style/nsCSSPseudoClassList.h b/layout/style/nsCSSPseudoClassList.h
index 6ec09714cc..7bdb244c0a 100644
--- a/layout/style/nsCSSPseudoClassList.h
+++ b/layout/style/nsCSSPseudoClassList.h
@@ -38,8 +38,6 @@
  * automatically defined to CSS_PSEUDO_CLASS.
  */
 
-#include "nsCSSPseudoElements.h"
-
 // OUTPUT_CLASS=nsCSSPseudoClasses
 // MACRO_NAME=CSS_PSEUDO_CLASS
 
diff --git a/layout/style/nsCSSPseudoClasses.cpp b/layout/style/nsCSSPseudoClasses.cpp
index 3c9bbf9bd3..6a6d1959c0 100644
--- a/layout/style/nsCSSPseudoClasses.cpp
+++ b/layout/style/nsCSSPseudoClasses.cpp
@@ -7,6 +7,7 @@
 
 #include "mozilla/ArrayUtils.h"
 
+#include "nsCSSPseudoElements.h"
 #include "nsCSSPseudoClasses.h"
 #include "nsStaticAtom.h"
 #include "mozilla/Preferences.h"