diff --git a/TOOLS/checktree.sh b/TOOLS/checktree.sh
index e2e4a1f3f1..fb8524bfe4 100755
--- a/TOOLS/checktree.sh
+++ b/TOOLS/checktree.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # -----------------------------------------------------------------------------
 
diff --git a/TOOLS/mencvcd.sh b/TOOLS/mencvcd.sh
index aed3c409f6..95cfbb2ebf 100755
--- a/TOOLS/mencvcd.sh
+++ b/TOOLS/mencvcd.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 # Version:          0.2.2
 #
diff --git a/TOOLS/mplmult.sh b/TOOLS/mplmult.sh
index a597bcf03e..e0d262f23e 100755
--- a/TOOLS/mplmult.sh
+++ b/TOOLS/mplmult.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # example how to output video on multiple windows in sync.
 # might be even more useful in combination with vo ggi
 # to distribute the video arbitrarily
diff --git a/TOOLS/psnr-video.sh b/TOOLS/psnr-video.sh
index 360073191f..8f2603ce65 100755
--- a/TOOLS/psnr-video.sh
+++ b/TOOLS/psnr-video.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # Helper script to ease comparing the PSNR between two video files
 # Copyleft 2005 by Matthias Wieser
 # Copyleft 2005 by Ivo