diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 09d0510eaaa6b292c0dd3b368f6270aec0318453..6ee641a3838d0b9f58a97341637109a36d5dcbe5 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -933,7 +933,7 @@ static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk,
 		 * queue management operation, to avoid breaking the ext <->
 		 * SSN association set here
 		 */
-		can_collapse = (size_goal - skb->len > 0) &&
+		can_collapse = (size_goal > skb->len) &&
 			      mptcp_skb_can_collapse_to(*write_seq, skb, mpext);
 		if (!can_collapse)
 			TCP_SKB_CB(skb)->eor = 1;