diff --git a/dabo/functions/get_macd_indicator.sh b/dabo/functions/get_macd_indicator.sh
index 046f78b..1d02963 100644
--- a/dabo/functions/get_macd_indicator.sh
+++ b/dabo/functions/get_macd_indicator.sh
@@ -109,7 +109,8 @@ function get_macd_indicator {
   # calculate MACD Histogram relation
   if [ $(tail -n36 "${f_hist_file}" | wc -l) -ge 35 ]
   then
-    local f_macd_histogram_max=$(tail -n60 "${f_hist_file}" | cut -d"," -f8 | egrep "^[0-9]|^-[0-9]" | sed 's/^-//' | sort -n | tail -n1)
+    local f_last_macd_relation_period=$(echo "35*(900/${INTERVAL})" | bc -l | sed 's/\..*//')
+    local f_macd_histogram_max=$(tail -n${f_last_macd_relation_period} "${f_hist_file}" | cut -d"," -f8 | egrep "^[0-9]|^-[0-9]" | sed 's/^-//' | sort -n | tail -n1)
     local f_macd_histogram_relation=$(echo "100+$(g_percentage-diff ${f_macd_histogram_max} ${f_macd_histogram})" | bc | sed 's/^\./0./; s/^-\./-0./' | cut -d\. -f1)
   fi