diff --git a/mi/mioverlay.c b/mi/mioverlay.c
index 0c1d79d70..23cc2b366 100644
--- a/mi/mioverlay.c
+++ b/mi/mioverlay.c
@@ -54,59 +54,3 @@ typedef struct {
     Bool underlayMarked;
     Bool copyUnderlay;
 } miOverlayScreenRec, *miOverlayScreenPtr;
-
-static DevPrivateKeyRec miOverlayWindowKeyRec;
-
-#define miOverlayWindowKey (&miOverlayWindowKeyRec)
-
-static void MarkUnderlayWindow(WindowPtr);
-
-#define MIOVERLAY_GET_WINDOW_PRIVATE(pWin) ((miOverlayWindowPtr) \
-	dixLookupPrivate(&(pWin)->devPrivates, miOverlayWindowKey))
-#define MIOVERLAY_GET_WINDOW_TREE(pWin) \
-	(MIOVERLAY_GET_WINDOW_PRIVATE(pWin)->tree)
-
-#define MARK_UNDERLAY(w) MarkUnderlayWindow(w)
-
-/*  We need this as an addition since the xf86 common code doesn't
-    know about the second tree which is static to this file.  */
-
-void
-miOverlaySetRootClip(ScreenPtr pScreen, Bool enable)
-{
-    WindowPtr pRoot = pScreen->root;
-    miOverlayTreePtr pTree = MIOVERLAY_GET_WINDOW_TREE(pRoot);
-
-    MARK_UNDERLAY(pRoot);
-
-    if (enable) {
-        BoxRec box;
-
-        box.x1 = 0;
-        box.y1 = 0;
-        box.x2 = pScreen->width;
-        box.y2 = pScreen->height;
-
-        RegionReset(&pTree->borderClip, &box);
-    }
-    else
-        RegionEmpty(&pTree->borderClip);
-
-    RegionBreak(&pTree->clipList);
-}
-
-/****************************************************************/
-
-static void
-MarkUnderlayWindow(WindowPtr pWin)
-{
-    miOverlayTreePtr pTree = MIOVERLAY_GET_WINDOW_TREE(pWin);
-
-    if (pTree->valdata)
-        return;
-    pTree->valdata =
-        (miOverlayValDataPtr) XNFalloc(sizeof(miOverlayValDataRec));
-    pTree->valdata->oldAbsCorner.x = pWin->drawable.x;
-    pTree->valdata->oldAbsCorner.y = pWin->drawable.y;
-    pTree->valdata->borderVisible = NullRegion;
-}
diff --git a/mi/mioverlay.h b/mi/mioverlay.h
index 68a88260a..857491dd3 100644
--- a/mi/mioverlay.h
+++ b/mi/mioverlay.h
@@ -9,6 +9,4 @@
 typedef void (*miOverlayTransFunc) (ScreenPtr, int, BoxPtr);
 typedef Bool (*miOverlayInOverlayFunc) (WindowPtr);
 
-extern _X_EXPORT void miOverlaySetRootClip(ScreenPtr, Bool);
-
 #endif                          /* __MIOVERLAY_H */