diff --git a/tests/wpt/mozilla/tests/mozilla/interfaces.html b/tests/wpt/mozilla/tests/mozilla/interfaces.html
index 245b8963737..f22cd342916 100644
--- a/tests/wpt/mozilla/tests/mozilla/interfaces.html
+++ b/tests/wpt/mozilla/tests/mozilla/interfaces.html
@@ -48,6 +48,7 @@ test_interfaces([
   "FocusEvent",
   "FormData",
   "HashChangeEvent",
+  "Headers",
   "HTMLAnchorElement",
   "HTMLAppletElement",
   "HTMLAreaElement",
diff --git a/tests/wpt/mozilla/tests/mozilla/interfaces.worker.js b/tests/wpt/mozilla/tests/mozilla/interfaces.worker.js
index aa723ef9ee5..79b99d4f1de 100644
--- a/tests/wpt/mozilla/tests/mozilla/interfaces.worker.js
+++ b/tests/wpt/mozilla/tests/mozilla/interfaces.worker.js
@@ -44,6 +44,7 @@ test_interfaces([
   "FocusEvent",
   "FormData",
   "HashChangeEvent",
+  "Headers",  
   "HTMLAnchorElement",
   "HTMLAppletElement",
   "HTMLAreaElement",