diff --git a/hw/dmx/dmxcmap.c b/hw/dmx/dmxcmap.c
index f46dc5411..b4279e7ce 100644
--- a/hw/dmx/dmxcmap.c
+++ b/hw/dmx/dmxcmap.c
@@ -46,7 +46,7 @@
 
 #include "micmap.h"
 
-static int dmxInitColormapPrivateFunc(ColormapPtr pColormap)
+static int dmxInitColormapPrivateFunc(ColormapPtr pColormap, int index)
 {
     return TRUE;
 }