diff --git a/tools/mockup.sh b/tools/mockup.sh
index 0acd84fa8..d5945319f 100755
--- a/tools/mockup.sh
+++ b/tools/mockup.sh
@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/bash
 
 if [ $# -eq 0 ]; then
     # With no args, read stdin to scrape compiler output.
diff --git a/tools/rel.sh b/tools/rel.sh
index 3f85f6648..64ad31be1 100755
--- a/tools/rel.sh
+++ b/tools/rel.sh
@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/bash
 
 from=${1}
 to=${2}
diff --git a/tools/update-mocks.sh b/tools/update-mocks.sh
index b9200b779..6ad1949eb 100755
--- a/tools/update-mocks.sh
+++ b/tools/update-mocks.sh
@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/bash
 # Script to rewrite the autogenerated mocks in a unit test between
 # /* AUTOGENERATED MOCKS START */ and /* AUTOGENERATED MOCKS END */
 # based on link failures.