diff --git a/imagebuild/tinyipa/build-tinyipa.sh b/imagebuild/tinyipa/build-tinyipa.sh
index dfb715051..b33d59c37 100755
--- a/imagebuild/tinyipa/build-tinyipa.sh
+++ b/imagebuild/tinyipa/build-tinyipa.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -ex
 WORKDIR=$(readlink -f $0 | xargs dirname)
diff --git a/imagebuild/tinyipa/finalise-tinyipa.sh b/imagebuild/tinyipa/finalise-tinyipa.sh
index e18945903..8bbf0f775 100755
--- a/imagebuild/tinyipa/finalise-tinyipa.sh
+++ b/imagebuild/tinyipa/finalise-tinyipa.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -ex
 WORKDIR=$(readlink -f $0 | xargs dirname)