diff --git a/tools/run-readtest.sh b/tools/run-readtest.sh
index abdfb254c7..7a7164b968 100755
--- a/tools/run-readtest.sh
+++ b/tools/run-readtest.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 dir=/tmp
 filesize=100 # megabytes
diff --git a/tools/run-threadreadtest.sh b/tools/run-threadreadtest.sh
index 76e177a659..4bd847852e 100755
--- a/tools/run-threadreadtest.sh
+++ b/tools/run-threadreadtest.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 dir=/tmp
 filesize=100 # megabytes
diff --git a/tools/run-writetest.sh b/tools/run-writetest.sh
index 807a1ffbcb..438defa45a 100755
--- a/tools/run-writetest.sh
+++ b/tools/run-writetest.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 dir=/tmp
 numfiles=128