diff --git a/inc/temp.inc.sh b/inc/temp.inc.sh
index b860590c..d8980dbe 100644
--- a/inc/temp.inc.sh
+++ b/inc/temp.inc.sh
@@ -653,7 +653,7 @@ SERVERROOM_TEMP_DIFFERENCE(){
 			# (( $(bc <<<"${largest_tempdiff} < 0") )) && tempdiff_tmp2=`echo "scale=2; ${largest_tempdiff} * -1" | bc` || tempdiff_tmp2=${largest_tempdiff}
 			# [ $(bc -l <<< "${tempdiff_tmp1} >= ${tempdiff_tmp2}") -eq 1 ] && largest_tempdiff=${tempdiff}
 			
-			[ "$(echo ${tempdiff} | grep '-')" != "" ] && tempdiff_tmp1=`echo "scale=2; ${tempdiff} * -1" | bc` || tempdiff_tmp1=${tempdiff}
+			(( $(bc <<<"${tempdiff} < 0") )) && tempdiff_tmp1=`echo "scale=2; ${tempdiff} * -1" | bc` || tempdiff_tmp1=${tempdiff}
 			[ $(bc -l <<< "${tempdiff_tmp1} >= ${largest_tempdiff}") -eq 1 ] && largest_tempdiff=${tempdiff_tmp1}
 			
 			# [ $(bc -l <<< "${tempdiff} >= ${largest_tempdiff}") -eq 1 ] && largest_tempdiff=${tempdiff}