diff --git a/CheckIntegrity b/CheckIntegrity
index d6aeb19..78cb3fc 100644
--- a/CheckIntegrity
+++ b/CheckIntegrity
@@ -16,8 +16,7 @@ error(){
 [ $# -ne 3 ] && printf "${bold}Input is wrong!${normal}\n\n" && error && exit -1
 
 # main code
-f=$1
-f+="sum $2 | cut -d ' ' -f1"
+f="$1sum $2 | cut -d ' ' -f1"
 
 if [ $(eval $f) = "$3" ]; then
     echo "$2 is ${bold}fine.${normal}"