diff --git a/libnm-glib/nm-secret-agent.c b/libnm-glib/nm-secret-agent.c
index a8c73213fd..f10a2584b2 100644
--- a/libnm-glib/nm-secret-agent.c
+++ b/libnm-glib/nm-secret-agent.c
@@ -458,7 +458,7 @@ validate_identifier (const char *identifier)
 
 	/* FIXME: do complete validation here */
 	while (p && *p) {
-		if (!isalnum (*p) && (*p != '_') && (*p != '-'))
+		if (!isalnum (*p) && (*p != '_') && (*p != '-') && (*p != '.'))
 			return FALSE;
 		if ((*p == '.') && (*(p + 1) == '.'))
 			return FALSE;