diff --git a/tests/server/sockfilt.c b/tests/server/sockfilt.c
index cf090cafb611d7b8ae647355e4b523c1121ff57e..3c549997d0eda6d6480417f1f62adc459bddd065 100644
--- a/tests/server/sockfilt.c
+++ b/tests/server/sockfilt.c
@@ -696,7 +696,7 @@ static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
 
   /* check if we got descriptors, sleep in case we got none */
   if(!nfds) {
-    Sleep((timeout->tv_sec * 1000) + (timeout->tv_usec / 1000));
+    Sleep((timeout->tv_sec*1000)+(DWORD)(((double)timeout->tv_usec)/1000.0));
     return 0;
   }