--- a/netwerk/base/nsUDPSocket.cpp
+++ b/netwerk/base/nsUDPSocket.cpp
@@ -451,17 +451,17 @@ UDPMessageProxy::GetOutputStream(nsIOutp
 
 void
 nsUDPSocket::OnSocketReady(PRFileDesc *fd, int16_t outFlags)
 {
   NS_ASSERTION(NS_SUCCEEDED(mCondition), "oops");
   NS_ASSERTION(mFD == fd, "wrong file descriptor");
   NS_ASSERTION(outFlags != -1, "unexpected timeout condition reached");
 
-  if (outFlags & (PR_POLL_ERR | PR_POLL_HUP | PR_POLL_NVAL))
+  if (outFlags & (PR_POLL_HUP | PR_POLL_NVAL))
   {
     NS_WARNING("error polling on listening socket");
     mCondition = NS_ERROR_UNEXPECTED;
     return;
   }
 
   PRNetAddr prClientAddr;
   uint32_t count;