1 files changed, 6 insertions, 6 deletions
diff --git a/acf/persistence/backends/files.lua b/acf/persistence/backends/files.lua
index b14ed10..7d03e12 100644
--- a/acf/persistence/backends/files.lua
+++ b/acf/persistence/backends/files.lua
@@ -17,9 +17,9 @@ local function get_scope(top)
       return
    end
 
-   return stringy.startswith(top.scope, '/files/') and string.sub(
-      top.scope, 7, -1
-   ) or nil
+   return stringy.startswith(
+      top.scope, '/files/'
+   ) and top.scope:sub(7, -1) or nil
 end
 
 
@@ -47,9 +47,9 @@ function backend:get(path, top)
 	 assert(scope)
 	 scope = scope..'/'
 
-	 local slen = string.len(scope)
-	 assert(string.sub(target, 1, slen) == scope)
-	 return string.sub(target, slen + 1, -1)
+	 local slen = scope:len()
+	 assert(target:sub(1, slen) == scope)
+	 return target:sub(slen + 1, -1)
 
       elseif t == 'directory' then
 	 local res = {}