diff --git a/scripts/install.sh b/scripts/install.sh
index d3ee03820..4d76f1df2 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -41,5 +41,5 @@ curl -fsSL  https://raw.githubusercontent.com/midoks/mdserver-web/master/scripts
 
 
 endTime=`date +%s`
-outTime=(${endTime}-${startTime})/60
+((outTime=(${endTime}-${startTime})/60))
 echo -e "Time consumed:\033[32m $outTime \033[0mMinute!"
\ No newline at end of file