diff --git a/deepmodeling_sphinx/inject.py b/deepmodeling_sphinx/inject.py
index 8348ab9..5635f75 100644
--- a/deepmodeling_sphinx/inject.py
+++ b/deepmodeling_sphinx/inject.py
@@ -132,7 +132,7 @@ def minify_js_files(app, exception):
         # not html builder
         return
     for js in app.builder.script_files:
-        fn = os.path.join(app.builder.outdir, js)
+        fn = os.path.join(app.builder.outdir, js.filename)
         if os.path.isfile(fn):
             with open(fn, "r+") as f:
                 minified_js = jsmin(f.read())
@@ -146,7 +146,7 @@ def minify_css_files(app, exception):
         # not html builder
         return
     for css in app.builder.css_files:
-        fn = os.path.join(app.builder.outdir, css)
+        fn = os.path.join(app.builder.outdir, css.filename)
         if os.path.isfile(fn):
             with open(fn, "r+") as f:
                 minified_css = cssmin(f.read())