diff --git a/accessible/src/atk/nsRootAccessibleWrap.cpp b/accessible/src/atk/nsRootAccessibleWrap.cpp
index 5710b9c9920..20ca7de731c 100644
--- a/accessible/src/atk/nsRootAccessibleWrap.cpp
+++ b/accessible/src/atk/nsRootAccessibleWrap.cpp
@@ -41,13 +41,16 @@
 
 #include "nsMai.h"
 #include "nsRootAccessibleWrap.h"
-#include "nsIAccessibleTreeCache.h"
 #include "nsAppRootAccessible.h"
 #include "nsIDOMWindow.h"
 #include "nsPIDOMWindow.h"
 #include "nsIDOMXULMultSelectCntrlEl.h"
 #include "nsIFocusController.h"
 
+#ifdef MOZ_XUL
+#include "nsIAccessibleTreeCache.h"
+#endif
+
 nsRootAccessibleWrap::nsRootAccessibleWrap(nsIDOMNode *aDOMNode,
                                            nsIWeakReference* aShell):
     nsRootAccessible(aDOMNode, aShell)