diff --git a/protocol.c b/protocol.c
index 68ddfe8..29d6487 100644
--- a/protocol.c
+++ b/protocol.c
@@ -1490,7 +1490,7 @@ enet_protocol_send_reliable_outgoing_commands (ENetHost * host, ENetPeer * peer)
                ! (outgoingCommand -> reliableSequenceNumber % ENET_PEER_RELIABLE_WINDOW_SIZE) &&
                (channel -> reliableWindows [(reliableWindow + ENET_PEER_RELIABLE_WINDOWS - 1) % ENET_PEER_RELIABLE_WINDOWS] >= ENET_PEER_RELIABLE_WINDOW_SIZE ||
                  channel -> usedReliableWindows & ((((1 << ENET_PEER_FREE_RELIABLE_WINDOWS) - 1) << reliableWindow) | 
-                   (((1 << ENET_PEER_FREE_RELIABLE_WINDOWS) - 1) >> (ENET_PEER_RELIABLE_WINDOW_SIZE - reliableWindow)))))
+                   (((1 << ENET_PEER_FREE_RELIABLE_WINDOWS) - 1) >> (ENET_PEER_RELIABLE_WINDOWS - reliableWindow)))))
              windowWrap = 1;
           if (windowWrap)
           {