diff --git a/plugins/time/chrony b/plugins/time/chrony
index 96e3ce0f..33469f05 100755
--- a/plugins/time/chrony
+++ b/plugins/time/chrony
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 #
 # Script to parse Chrony Tracking Output
 #
@@ -52,11 +52,11 @@ if [ "$1" = "config" ]; then
 	echo 'graph_category time'    
 		i=0
 		for a in $fields ; do
-			i=$(expr $i + 1);
-			word=`echo $fieldnames | cut -f $i -d '='`;
-			factor=`echo $fieldfactors | cut -f $i -d ' '`;
+			i=$((i + 1))
+			word="$(echo "$fieldnames" | cut -f "$i" -d '=')"
+			factor="$(echo "$fieldfactors" | cut -f "$i" -d ' ')"
 			echo "$a.label $word$factor)";
-			echo "$a.type GAUGE";
+			echo "$a.type GAUGE"
 		done
         exit 0
 fi