diff --git a/mi/mi.h b/mi/mi.h
index 04f4f08ea..577bd006e 100644
--- a/mi/mi.h
+++ b/mi/mi.h
@@ -280,10 +280,6 @@ extern _X_EXPORT void miPolylines(DrawablePtr pDrawable,
 
 /* miwindow.c */
 
-extern _X_EXPORT void miChangeBorderWidth(WindowPtr /*pWin */ ,
-                                          unsigned int  /*width */
-    );
-
 extern _X_EXPORT void miMarkUnrealizedWindow(WindowPtr /*pChild */ ,
                                              WindowPtr /*pWin */ ,
                                              Bool       /*fromConfigure */
diff --git a/mi/mi_priv.h b/mi/mi_priv.h
index be0ad5e90..69b7a1fae 100644
--- a/mi/mi_priv.h
+++ b/mi/mi_priv.h
@@ -65,5 +65,6 @@ void miResizeWindow(WindowPtr pWin, int x, int y, unsigned int w,
                     unsigned int h, WindowPtr pSib);
 WindowPtr miGetLayerWindow(WindowPtr pWin);
 void miSetShape(WindowPtr pWin, int kind);
+void miChangeBorderWidth(WindowPtr pWin, unsigned int width);
 
 #endif /* _XSERVER_MI_PRIV_H */