diff --git a/src/vb_setmode.h b/src/vb_setmode.h
index d8935d9..6bcd2a1 100644
--- a/src/vb_setmode.h
+++ b/src/vb_setmode.h
@@ -53,7 +53,5 @@ extern   BOOLEAN  XGI_BridgeIsOn( PVB_DEVICE_INFO );
 extern   BOOLEAN  XGI_SetCRT2Group301(USHORT ModeNo, PXGI_HW_DEVICE_INFO HwDeviceExtension, PVB_DEVICE_INFO);
 extern   USHORT   XGI_GetRatePtrCRT2( USHORT ModeNo,USHORT ModeIdIndex, PVB_DEVICE_INFO );
 
-extern USHORT XGI_GetColorDepth(USHORT ModeNo, USHORT ModeIdIndex,
-    const VB_DEVICE_INFO *pVBInfo);
 
 #endif