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-rw-r--r--dom/html/HTMLOptGroupElement.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/dom/html/HTMLOptGroupElement.cpp b/dom/html/HTMLOptGroupElement.cpp
index ad2527dc92..a65a79ecf5 100644
--- a/dom/html/HTMLOptGroupElement.cpp
+++ b/dom/html/HTMLOptGroupElement.cpp
@@ -13,6 +13,10 @@
#include "nsIFrame.h"
#include "nsIFormControlFrame.h"
+#if defined(MOZ_X11)
+#include "X11UndefineNone.h"
+#endif
+
NS_IMPL_NS_NEW_HTML_ELEMENT(OptGroup)
namespace mozilla {