diff --git a/gtk/spice-option.c b/gtk/spice-option.c
index dbee5ac..ea5d226 100644
--- a/gtk/spice-option.c
+++ b/gtk/spice-option.c
@@ -46,9 +46,10 @@ static void option_version(void)
     exit(0);
 }
 
-static void option_debug(void)
+static gboolean option_debug(void)
 {
     spice_util_set_debug(TRUE);
+    return TRUE;
 }
 
 /**