diff --git a/mysql-test/mysql-test-run.pl b/mysql-test/mysql-test-run.pl
index 57bd12f7b05..451bcc45347 100755
--- a/mysql-test/mysql-test-run.pl
+++ b/mysql-test/mysql-test-run.pl
@@ -1959,7 +1959,7 @@ sub environment_setup () {
   # ----------------------------------------------------
   my $cmdline_mysqlbinlog=
     mtr_native_path($exe_mysqlbinlog) .
-      "--no-defaults";
+      " --no-defaults";
   if (!$opt_extern && $mysql_version_id >= 50000 )
   {
     $cmdline_mysqlbinlog .=" --character-sets-dir=$path_charsetsdir";