diff --git a/libnm-core/nm-setting-wired.c b/libnm-core/nm-setting-wired.c
index 71add93888..450ad1debc 100644
--- a/libnm-core/nm-setting-wired.c
+++ b/libnm-core/nm-setting-wired.c
@@ -790,7 +790,7 @@ verify (NMSetting *setting, NMConnection *connection, GError **error)
 	}
 
 	if (priv->s390_subchannels) {
-		int len = g_strv_length (priv->s390_subchannels);
+		guint len = g_strv_length (priv->s390_subchannels);
 
 		if (len != 2 && len != 3) {
 			g_set_error_literal (error,