diff --git a/os/WaitFor.c b/os/WaitFor.c
index 431f1a6b6..993c14e52 100644
--- a/os/WaitFor.c
+++ b/os/WaitFor.c
@@ -158,6 +158,7 @@ WaitForSomething(int *pClientsReady)
     Bool someReady = FALSE;
 
     FD_ZERO(&clientsReadable);
+    FD_ZERO(&clientsWritable);
 
     if (nready)
         SmartScheduleStopTimer();