diff --git a/check_temp.sh b/check_temp.sh
index 084b064..20a1181 100755
--- a/check_temp.sh
+++ b/check_temp.sh
@@ -227,7 +227,7 @@ printf "\n\n"
 fi
 
 # Get performance data for Nagios "Performance Data" field
-PERFDATA=`${SENSORPROG} | grep "$sensor"`
+PERFDATA=`${SENSORPROG} | grep "$sensor" | head -n1`
 
 
 # And finally check the temperature against our thresholds