diff --git a/inst-raps.sh b/inst-raps.sh
index af622b8..921f3e0 100755
--- a/inst-raps.sh
+++ b/inst-raps.sh
@@ -184,10 +184,11 @@ printSuccess "Role updated successfully"
 #-----------------------------------------------------------------------------
 printInfo "CleanUp"
 rm -rf /tmp/yumupd
-rerror=$?
+rerror1=$?
 rm -rf /tmp/hostsupd
-let "$rerror=$rerror+$?"
-if [ $rerror -ne 0 ]; then printError "Problem to cleanUP";exit; fi
+$rerror2=$?
+sum=$(( $rerror1 + $rerror2 ))
+if [ $sum -ne 0 ]; then printError "Problem to cleanUP";exit; fi
 printSuccess "CleanUp successfully"
 
 #-----------------------------------------------------------------------------