diff --git a/mi/mioverlay.c b/mi/mioverlay.c
index 0ee99057e..b997322a5 100644
--- a/mi/mioverlay.c
+++ b/mi/mioverlay.c
@@ -108,12 +108,6 @@ miOverlaySetTransFunction(ScreenPtr pScreen, miOverlayTransFunc transFunc)
     MIOVERLAY_GET_SCREEN_PRIVATE(pScreen)->MakeTransparent = transFunc;
 }
 
-Bool
-miOverlayCopyUnderlay(ScreenPtr pScreen)
-{
-    return MIOVERLAY_GET_SCREEN_PRIVATE(pScreen)->copyUnderlay;
-}
-
 static void
 MarkUnderlayWindow(WindowPtr pWin)
 {
diff --git a/mi/mioverlay.h b/mi/mioverlay.h
index 1ca0868d5..a1e38e596 100644
--- a/mi/mioverlay.h
+++ b/mi/mioverlay.h
@@ -9,7 +9,6 @@
 typedef void (*miOverlayTransFunc) (ScreenPtr, int, BoxPtr);
 typedef Bool (*miOverlayInOverlayFunc) (WindowPtr);
 
-extern _X_EXPORT Bool miOverlayCopyUnderlay(ScreenPtr);
 extern _X_EXPORT void miOverlaySetTransFunction(ScreenPtr, miOverlayTransFunc);
 extern _X_EXPORT void miOverlaySetRootClip(ScreenPtr, Bool);