diff --git a/process-templates b/process-templates
index 703acc74..8f24d921 100755
--- a/process-templates
+++ b/process-templates
@@ -1,22 +1,18 @@
 #!/usr/bin/env python3
 
 from jinja2 import FileSystemLoader, Environment
+from pathlib import Path
 import os
 import sys
 
-ROOT_DIR = sys.argv[1]
+ROOT_DIR = Path(sys.argv[1])
 TEMPLATE_PATH_LIST = [ROOT_DIR, "templates/"]
 
 loader = FileSystemLoader(searchpath=TEMPLATE_PATH_LIST)
 environment = Environment(loader=loader, autoescape=True)
 
-template_file_list = []
-for dirpath, dirnames, filenames in os.walk(ROOT_DIR):
-    for filename in filenames:
-        if filename.endswith(".html"):
-            template_file_list.append(
-                (os.path.join(dirpath, filename)).split(sep=os.path.sep, maxsplit=1)[1]
-            )
+file_path_list = ROOT_DIR.glob("**/*.html")
+template_file_list = [os.fspath(p.relative_to(ROOT_DIR)) for p in file_path_list]
 
 for template_file in template_file_list:
     template = environment.get_template(template_file)