diff --git a/os/io.c b/os/io.c
index 841a0ee40..83b01111f 100644
--- a/os/io.c
+++ b/os/io.c
@@ -890,9 +890,6 @@ FlushClient(ClientPtr who, OsCommPtr oc, const void *__extraBuf, int extraCount)
             todo = notWritten;
         }
         else if (ETEST(errno)
-#ifdef SUNSYSV                  /* check for another brain-damaged OS bug */
-                 || (errno == 0)
-#endif
 #ifdef EMSGSIZE                 /* check for another brain-damaged OS bug */
                  || ((errno == EMSGSIZE) && (todo == 1))
 #endif