diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index a8f33e826134..b725bd3144fb 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -85,6 +85,7 @@ smb2_add_credits(struct TCP_Server_Info *server,
 		*val = 65000; /* Don't get near 64K credits, avoid srv bugs */
 		pr_warn_once("server overflowed SMB3 credits\n");
 	}
+	WARN_ON_ONCE(server->in_flight == 0);
 	server->in_flight--;
 	if (server->in_flight == 0 &&
 	   ((optype & CIFS_OP_MASK) != CIFS_NEG_OP) &&