diff --git a/mysql-test/t/long_tmpdir-master.sh b/mysql-test/t/long_tmpdir-master.sh
index 318955fbcca..7bcbee26105 100644
--- a/mysql-test/t/long_tmpdir-master.sh
+++ b/mysql-test/t/long_tmpdir-master.sh
@@ -1,3 +1,4 @@
+#!/bin/sh
 d="$MYSQLTEST_VARDIR/tmp/long_temporary_directory_path_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789"
 test -d "$d" || mkdir "$d"
 rm -f "$d"/*
diff --git a/mysql-test/t/lowercase_mixed_tmpdir-master.sh b/mysql-test/t/lowercase_mixed_tmpdir-master.sh
index 95c26e3aa02..9330d0581ee 100644
--- a/mysql-test/t/lowercase_mixed_tmpdir-master.sh
+++ b/mysql-test/t/lowercase_mixed_tmpdir-master.sh
@@ -1,3 +1,4 @@
+#!/bin/sh
 # This test requires a non-lowercase tmpdir directory on a case-sensitive
 # filesystem.
 
diff --git a/sql-bench/graph-compare-results.sh b/sql-bench/graph-compare-results.sh
index 317ef583886..ddc9080acd6 100644
--- a/sql-bench/graph-compare-results.sh
+++ b/sql-bench/graph-compare-results.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/perl
 ####
 #### Hello ... this is a heavily hacked script by Luuk 
 #### instead of printing the result it makes a nice gif