diff --git a/script/ci-custom.py b/script/ci-custom.py
index 106aa438fe..609d89403f 100755
--- a/script/ci-custom.py
+++ b/script/ci-custom.py
@@ -554,10 +554,10 @@ def convert_path_to_relative(abspath, current):
         "esphome/components/web_server/__init__.py",
     ],
 )
-def lint_relative_py_import(fname, line, col, content):
+def lint_relative_py_import(fname: Path, line, col, content):
     import_line = content.splitlines()[line]
     abspath = import_line[col:].split(" ")[0]
-    current = fname.removesuffix(".py").replace(os.path.sep, ".")
+    current = str(fname).removesuffix(".py").replace(os.path.sep, ".")
     replacement = convert_path_to_relative(abspath, current)
     newline = import_line.replace(abspath, replacement)
     return (