diff --git a/dix/colormap.c b/dix/colormap.c
index 2cafe4b0ea..372098341a 100644
--- a/dix/colormap.c
+++ b/dix/colormap.c
@@ -2521,6 +2521,7 @@ struct colormap_lookup_data {
 static void
 _colormap_find_resource(void *value, XID id, void *cdata)
 {
+    (void) id;
     struct colormap_lookup_data *cmap_data = cdata;
     VisualPtr visuals = cmap_data->visuals;
     ScreenPtr pScreen = cmap_data->pScreen;