diff --git a/contrib/subtree/git-subtree.sh b/contrib/subtree/git-subtree.sh
index 10daa8b0eb..51ae932e5e 100755
--- a/contrib/subtree/git-subtree.sh
+++ b/contrib/subtree/git-subtree.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 #
 # git-subtree.sh: split/join git repositories in subdirectories of this one
 #