diff --git a/criu/mount.c b/criu/mount.c
index 5a97c1f1b..f578c7b6a 100644
--- a/criu/mount.c
+++ b/criu/mount.c
@@ -3179,7 +3179,7 @@ static int populate_mnt_ns(void)
 	return ret;
 }
 
-int __depopulate_roots_yard(void)
+static int __depopulate_roots_yard(void)
 {
 	int ret = 0;