diff --git a/client/mysqltest.c b/client/mysqltest.c
index f678eb98eec..d9f1f25e093 100644
--- a/client/mysqltest.c
+++ b/client/mysqltest.c
@@ -1677,12 +1677,14 @@ void do_exec(struct st_command *command)
   }
 
 #ifdef __WIN__
+#ifndef USE_CYGWIN
   /* Replace /dev/null with NUL */
   while(replace(&ds_cmd, "/dev/null", 9, "NUL", 3) == 0)
     ;
   /* Replace "closed stdout" with non existing output fd */
   while(replace(&ds_cmd, ">&-", 3, ">&4", 3) == 0)
     ;
+#endif
 #endif
 
   DBUG_PRINT("info", ("Executing '%s' as '%s'",
@@ -1847,10 +1849,12 @@ void do_system(struct st_command *command)
   do_eval(&ds_cmd, command->first_argument, command->end, !is_windows);
 
 #ifdef __WIN__
+#ifndef USE_CYGWIN
    /* Replace /dev/null with NUL */
    while(replace(&ds_cmd, "/dev/null", 9, "NUL", 3) == 0)
      ;
 #endif
+#endif
 
 
   DBUG_PRINT("info", ("running system command '%s' as '%s'",