diff --git a/win32port/win32helpers/websock-w32.c b/win32port/win32helpers/websock-w32.c
index bec150b1..ec3022e9 100644
--- a/win32port/win32helpers/websock-w32.c
+++ b/win32port/win32helpers/websock-w32.c
@@ -46,7 +46,7 @@ INT WSAAPI emulated_poll(LPWSAPOLLFD fdarray, ULONG nfds, INT timeout)
 
 		poll_fd->revents = 0;
 
-		if (poll_fd->fd < 0 || !poll_fd->events)
+		if ((int)poll_fd->fd < 0 || !poll_fd->events)
 			goto skip1;
 
 		if (max_socket < poll_fd->fd)