diff --git a/unix/vncserver b/unix/vncserver
index a9b1b19..8f36d79 100755
--- a/unix/vncserver
+++ b/unix/vncserver
@@ -306,7 +306,7 @@
 	die "$prog: geometry $geometry is invalid\n";
     }
 
-    if (($depth < 8) || ($depth > 32)) {
+    if ($depth && (($depth < 8) || ($depth > 32))) {
 	die "Depth must be between 8 and 32\n";
     }
 }