diff --git a/dix/window_priv.h b/dix/window_priv.h
index e01c46fd56..ee8fca42f2 100644
--- a/dix/window_priv.h
+++ b/dix/window_priv.h
@@ -11,6 +11,8 @@
 #include "include/window.h"
 #include "include/windowstr.h"
 
+extern Mask DontPropagateMasks[];
+
 #define wTrackParent(w,field)   ((w)->optional ? \
                                     (w)->optional->field \
                                  : FindWindowWithOptional(w)->optional->field)
diff --git a/include/windowstr.h b/include/windowstr.h
index 9510c0ef84..0656fdf9d0 100644
--- a/include/windowstr.h
+++ b/include/windowstr.h
@@ -156,8 +156,6 @@ typedef struct _Window {
     PropertyPtr properties;     /* default: NULL */
 } WindowRec;
 
-extern _X_EXPORT Mask DontPropagateMasks[];
-
 #define wBorderWidth(w)		((int) (w)->borderWidth)
 
 static inline PropertyPtr wUserProps(WindowPtr pWin) { return pWin->properties; }