diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 7e1518bb6115..8ffb8aabd324 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -323,9 +323,10 @@ static bool mptcp_rmem_schedule(struct sock *sk, struct sock *ssk, int size)
 	struct mptcp_sock *msk = mptcp_sk(sk);
 	int amt, amount;
 
-	if (size < msk->rmem_fwd_alloc)
+	if (size <= msk->rmem_fwd_alloc)
 		return true;
 
+	size -= msk->rmem_fwd_alloc;
 	amt = sk_mem_pages(size);
 	amount = amt << SK_MEM_QUANTUM_SHIFT;
 	msk->rmem_fwd_alloc += amount;