diff --git a/mi/mi.h b/mi/mi.h
index b1317bfc1..54150e370 100644
--- a/mi/mi.h
+++ b/mi/mi.h
@@ -280,9 +280,6 @@ extern _X_EXPORT void miPolylines(DrawablePtr pDrawable,
 
 /* miwindow.c */
 
-extern _X_EXPORT void miHandleValidateExposures(WindowPtr       /*pWin */
-    );
-
 extern _X_EXPORT void miMoveWindow(WindowPtr /*pWin */ ,
                                    int /*x */ ,
                                    int /*y */ ,
diff --git a/mi/mi_priv.h b/mi/mi_priv.h
index 55b4580da..6a4f60999 100644
--- a/mi/mi_priv.h
+++ b/mi/mi_priv.h
@@ -58,5 +58,6 @@ void miClearToBackground(WindowPtr pWin, int x, int y, int w, int h,
 void miMarkWindow(WindowPtr pWin);
 Bool miMarkOverlappedWindows(WindowPtr pWin, WindowPtr pFirst,
                              WindowPtr *ppLayerWin);
+void miHandleValidateExposures(WindowPtr pWin);
 
 #endif /* _XSERVER_MI_PRIV_H */