diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index b8e3e80..a3c3937 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -831,8 +831,8 @@
 	char *umid, *title;
 	int len;
 
-	umid = get_umid(1);
-	if(umid == NULL)
+	umid = get_umid();
+	if(*umid == '\0')
 		return base;
 
 	len = strlen(base) + strlen(" ()") + strlen(umid) + 1;