diff --git a/docs/Rakefile b/docs/Rakefile
index 487015a302..bbb8bd3a12 100644
--- a/docs/Rakefile
+++ b/docs/Rakefile
@@ -20,7 +20,6 @@ task test: :build do
     parallel: { in_threads: 4 },
     favicon: true,
     ignore_status_codes: [0, 403],
-    assume_extension: true,
     check_favicon: true,
     check_opengraph: true,
     check_html: true,