diff --git a/src/dns/nm-dns-manager.c b/src/dns/nm-dns-manager.c
index 33a414831f..45b5556709 100644
--- a/src/dns/nm-dns-manager.c
+++ b/src/dns/nm-dns-manager.c
@@ -589,7 +589,9 @@ create_resolv_conf (char **searches,
 	GString *str;
 	gsize i;
 
-	str = g_string_new_len ("# Generated by NetworkManager\n", 245);
+	str = g_string_new_len (NULL, 245);
+
+	g_string_append (str, "# Generated by NetworkManager\n");
 
 	if (searches && searches[0]) {
 		g_string_append (str, "search");