diff --git a/lib/meandro/meandro_config_parser.ex b/lib/meandro/meandro_config_parser.ex
index ec935ca..0767ac9 100644
--- a/lib/meandro/meandro_config_parser.ex
+++ b/lib/meandro/meandro_config_parser.ex
@@ -108,12 +108,18 @@ defmodule Meandro.ConfigParser do
         do: Meandro.Util.module_name_from_file_path(file)
   end
 
-  defp rule_files() do
-    __ENV__.file
-    |> Path.split()
-    |> Enum.slice(0..-4)
+defp rule_files() do
+  path_parts = Path.split(__ENV__.file)
+
+  if length(path_parts) >= 4 do
+    path_parts
+    |> Enum.take(length(path_parts) - 3)  # Equivalent to 0..-4
     |> Path.join()
     |> Path.join(@rules_wildcard)
     |> Path.wildcard()
+  else
+    []
   end
 end
+
+end