diff --git a/common/functions.sh b/common/functions.sh
index 1aa8a4f..743825b 100644
--- a/common/functions.sh
+++ b/common/functions.sh
@@ -79,10 +79,9 @@ get_system_used_space() {
 }
 
 human_readable_bytes() {
-  local spacebytes="$1"
-  spacekb=`expr $spacebytes / 1024`
-  spacemb=`expr $spacebytes / 1024 / 1024`
-  spacegb=`expr $spacebytes / 1024 / 1024 / 1024`
+  spacekb=`expr $1 / 1024`
+  spacemb=`expr $1 / 1024 / 1024`
+  spacegb=`expr $1 / 1024 / 1024 / 1024`
 
   if [[ "$spacegb" -gt 0 ]]
   then