diff --git a/data/s1.sh b/data/s1.sh
index c4ccfdb75..d9b65259c 100755
--- a/data/s1.sh
+++ b/data/s1.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 mlr --opprint "$@" stats1 -a mean,sum,count,min,max -f i,x,y -g a,b ../data/medium
 echo
 mlr --opprint "$@" stats1 -a mean,sum,count,min,max -f i,x,y ../data/medium