diff --git a/powerwall.sh b/powerwall.sh
index 50ab9a07..e1bc5d07 100755
--- a/powerwall.sh
+++ b/powerwall.sh
@@ -915,7 +915,7 @@ fi
 				echo "${RPMn}"
 				RPM_tot=$(expr ${RPM_tot} + ${RPMn})
 			done
-			RPM=$(ROUND_NUMBER $(bc <<< "scale=0; {RPM_tot}/${#RPMs}"))
+			RPM=$(ROUND_NUMBER $(bc -l <<< "scale=0; {RPM_tot}/${#RPMs}"))
 			echo "AVG: ${RPM}"