diff --git a/src/nm-dispatcher.c b/src/nm-dispatcher.c
index 4e0a05ed7..8fdb43dfb 100644
--- a/src/nm-dispatcher.c
+++ b/src/nm-dispatcher.c
@@ -372,7 +372,7 @@ static const char *action_table[] = {
 static const char *
 action_to_string (DispatcherAction action)
 {
-	g_assert (action >= 0 && action < G_N_ELEMENTS (action_table));
+	g_assert ((gsize) action < G_N_ELEMENTS (action_table));
 	return action_table[action];
 }