diff --git a/src/lxc/conf.c b/src/lxc/conf.c
index e854b8b03..5c66c6f35 100644
--- a/src/lxc/conf.c
+++ b/src/lxc/conf.c
@@ -4497,6 +4497,7 @@ void suggest_default_idmap(void)
 	if (!urange || !grange) {
 		ERROR("You do not have subuids or subgids allocated");
 		ERROR("Unprivileged containers require subuids and subgids");
+		free(uname);
 		return;
 	}