diff --git a/cmds-subvolume.c b/cmds-subvolume.c
index 96fdcca7..f57694a1 100644
--- a/cmds-subvolume.c
+++ b/cmds-subvolume.c
@@ -288,6 +288,8 @@ again:
 out:
 	free(dupdname);
 	free(dupvname);
+	dupdname = NULL;
+	dupvname = NULL;
 	cnt++;
 	if (cnt < argc)
 		goto again;