diff --git a/dlls/ws2_32/socket.c b/dlls/ws2_32/socket.c
index a7e3e0ab0d7..fe7e4fb3464 100644
--- a/dlls/ws2_32/socket.c
+++ b/dlls/ws2_32/socket.c
@@ -2574,7 +2574,7 @@ int WINAPI WSAPoll( WSAPOLLFD *fds, ULONG count, int timeout )
         return SOCKET_ERROR;
     }
 
-    params->timeout = (timeout >= 0 ? timeout * -10000 : TIMEOUT_INFINITE);
+    params->timeout = (timeout >= 0 ? (LONGLONG)timeout * -10000 : TIMEOUT_INFINITE);
 
     for (i = 0; i < count; ++i)
     {