diff --git a/src/nm-agent-manager.c b/src/nm-agent-manager.c
index d31df7054..9bdc72d39 100644
--- a/src/nm-agent-manager.c
+++ b/src/nm-agent-manager.c
@@ -177,7 +177,7 @@ validate_identifier (const char *identifier, GError **error)
 
 	/* FIXME: do complete validation here */
 	while (p && *p) {
-		if (!isalnum (*p) && (*p != '_') && (*p != '-')) {
+		if (!isalnum (*p) && (*p != '_') && (*p != '-') && (*p != '.')) {
 			g_set_error (error,
 			             NM_AGENT_MANAGER_ERROR,
 				         NM_AGENT_MANAGER_ERROR_INVALID_IDENTIFIER,