diff --git a/client/mysqltest.c b/client/mysqltest.c
index 84779ae73fc..58a0e90824c 100644
--- a/client/mysqltest.c
+++ b/client/mysqltest.c
@@ -1694,12 +1694,14 @@ 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'",
@@ -1864,10 +1866,12 @@ 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'",
@@ -5954,7 +5958,9 @@ int main(int argc, char **argv)
 
   init_builtin_echo();
 #ifdef __WIN__
+#ifndef USE_CYGWIN
   is_windows= 1;
+#endif
   init_tmp_sh_file();
   init_win_path_patterns();
 #endif
diff --git a/mysql-test/lib/mtr_misc.pl b/mysql-test/lib/mtr_misc.pl
index 40d74f8da55..dc22f88bd7f 100644
--- a/mysql-test/lib/mtr_misc.pl
+++ b/mysql-test/lib/mtr_misc.pl
@@ -68,6 +68,12 @@ sub mtr_short_hostname () {
 sub mtr_native_path($)
 {
   my $path= shift;
+
+  # MySQL version before 5.0 still use cygwin, no need
+  # to convert path
+  return $path
+    if ($::mysql_version_id < 50000);
+
   $path=~ s/\//\\/g
     if ($::glob_win32);
   return $path;
diff --git a/mysql-test/mysql-test-run.pl b/mysql-test/mysql-test-run.pl
index 4d385ddee66..9f1ab7a73d0 100755
--- a/mysql-test/mysql-test-run.pl
+++ b/mysql-test/mysql-test-run.pl
@@ -3793,7 +3793,7 @@ sub mysqld_arguments ($$$$$) {
     if ( $mysql_version_id <= 50106 )
     {
       # Force mysqld to use log files up until 5.1.6
-      mtr_add_arg($args, "%s--log=%s", $prefix, $master->[0]->{'path_mylog'});
+      mtr_add_arg($args, "%s--log=%s", $prefix, $slave->[0]->{'path_mylog'});
     }
     else
     {