diff --git a/tools/git-submodule/install b/tools/git-submodule/install
index b1baa33..ca1e329 100755
--- a/tools/git-submodule/install
+++ b/tools/git-submodule/install
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 set -e
 
diff --git a/tools/hg-subrepo/install b/tools/hg-subrepo/install
index 3d97dd0..e809e93 100755
--- a/tools/hg-subrepo/install
+++ b/tools/hg-subrepo/install
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 set -e