diff --git a/test/system/001-minimal b/test/system/001-minimal
index daa1f73..107fa3f 100755
--- a/test/system/001-minimal
+++ b/test/system/001-minimal
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 . ./test.common
 
diff --git a/test/system/002-extended b/test/system/002-extended
index 03728c8..7a6734f 100755
--- a/test/system/002-extended
+++ b/test/system/002-extended
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 . ./test.common
 
diff --git a/test/system/003-memlock b/test/system/003-memlock
index 0369d1e..e4ab1bf 100755
--- a/test/system/003-memlock
+++ b/test/system/003-memlock
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 . ./test.common
 
diff --git a/test/system/004-priority b/test/system/004-priority
index 976747b..bf8a04b 100755
--- a/test/system/004-priority
+++ b/test/system/004-priority
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 . ./test.common
 
diff --git a/test/system/005-scfilter b/test/system/005-scfilter
index 285d14d..778a688 100755
--- a/test/system/005-scfilter
+++ b/test/system/005-scfilter
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 . ./test.common
 
diff --git a/test/system/006-privdrop b/test/system/006-privdrop
index 5756534..6d7b0c9 100755
--- a/test/system/006-privdrop
+++ b/test/system/006-privdrop
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 . ./test.common
 
diff --git a/test/system/007-cmdmon b/test/system/007-cmdmon
index f97954a..f705fb0 100755
--- a/test/system/007-cmdmon
+++ b/test/system/007-cmdmon
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 . ./test.common
 
diff --git a/test/system/100-clockupdate b/test/system/100-clockupdate
index 1d698e1..191e461 100755
--- a/test/system/100-clockupdate
+++ b/test/system/100-clockupdate
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 . ./test.common
 
diff --git a/test/system/101-rtc b/test/system/101-rtc
index 82c8d51..fa9a70d 100755
--- a/test/system/101-rtc
+++ b/test/system/101-rtc
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 . ./test.common
 
diff --git a/test/system/102-hwtimestamp b/test/system/102-hwtimestamp
index a09b1d9..86f2287 100755
--- a/test/system/102-hwtimestamp
+++ b/test/system/102-hwtimestamp
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 . ./test.common
 
diff --git a/test/system/103-refclock b/test/system/103-refclock
index 623b9de..e5b74e0 100755
--- a/test/system/103-refclock
+++ b/test/system/103-refclock
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 . ./test.common
 
diff --git a/test/system/104-systemdirs b/test/system/104-systemdirs
index a8ee056..15508dc 100755
--- a/test/system/104-systemdirs
+++ b/test/system/104-systemdirs
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 TEST_LIBDIR=${CHRONY_LIBDIR:-/var/lib/chrony}
 TEST_LOGDIR=${CHRONY_LOGDIR:-/var/log/chrony}
diff --git a/test/system/run b/test/system/run
index b31a36c..5516ed4 100755
--- a/test/system/run
+++ b/test/system/run
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 print_help() {
 	echo "$1 [-a] [-d] [TEST]..."
diff --git a/test/system/test.common b/test/system/test.common
index 9ac05bb..28c4805 100644
--- a/test/system/test.common
+++ b/test/system/test.common
@@ -38,7 +38,7 @@ test_start() {
 	if [ "$user" != "root" ]; then
 		id -u "$user" > /dev/null 2> /dev/null || test_skip "missing user $user"
 		chown "$user:$(id -g "$user")" "$TEST_DIR" || test_skip "could not chown $TEST_DIR"
-		su "$user" -s /bin/bash -c "touch $TEST_DIR/test" 2> /dev/null || \
+		su "$user" -s /bin/sh -c "touch $TEST_DIR/test" 2> /dev/null || \
 			test_skip "$user cannot access $TEST_DIR"
 		rm "$TEST_DIR/test"
 	fi