diff --git a/02_dnsping-graph.sh b/02_dnsping-graph.sh
index f29dcf8..123f050 100755
--- a/02_dnsping-graph.sh
+++ b/02_dnsping-graph.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 cd ~/dev/dnspingtest_rrd/ || exit 1