diff --git a/src/settings/nm-settings-connection.c b/src/settings/nm-settings-connection.c
index bce3dff10..6bed3fe5f 100644
--- a/src/settings/nm-settings-connection.c
+++ b/src/settings/nm-settings-connection.c
@@ -1736,7 +1736,8 @@ settings_connection_update_helper (NMSettingsConnection *self,
 	/* Check if the settings are valid first */
 	if (new_settings) {
 		tmp = _nm_simple_connection_new_from_dbus (new_settings,
-		                                           NM_SETTING_PARSE_FLAGS_NORMALIZE,
+		                                             NM_SETTING_PARSE_FLAGS_STRICT
+		                                           | NM_SETTING_PARSE_FLAGS_NORMALIZE,
 		                                           &error);
 		if (!tmp)
 			goto error;
diff --git a/src/settings/nm-settings.c b/src/settings/nm-settings.c
index fc2daa063..77e45f498 100644
--- a/src/settings/nm-settings.c
+++ b/src/settings/nm-settings.c
@@ -1408,7 +1408,8 @@ impl_settings_add_connection_helper (NMSettings *self,
 	GError *error = NULL;
 
 	connection = _nm_simple_connection_new_from_dbus (settings,
-	                                                  NM_SETTING_PARSE_FLAGS_NORMALIZE,
+	                                                    NM_SETTING_PARSE_FLAGS_STRICT
+	                                                  | NM_SETTING_PARSE_FLAGS_NORMALIZE,
 	                                                  &error);
 
 	if (connection) {