diff --git a/lib/webrick/httputils.rb b/lib/webrick/httputils.rb
index a4cd3b4..3a28919 100644
--- a/lib/webrick/httputils.rb
+++ b/lib/webrick/httputils.rb
@@ -95,6 +95,7 @@ def normalize_path(path)
       "tif"   => "image/tiff",
       "tiff"  => "image/tiff",
       "txt"   => "text/plain",
+      "wasm"  => "application/wasm",
       "xbm"   => "image/x-xbitmap",
       "xhtml" => "text/html",
       "xls"   => "application/vnd.ms-excel",