diff --git a/components/script/dom/testbinding.rs b/components/script/dom/testbinding.rs
index 6854ef493ee..31fa20f0409 100644
--- a/components/script/dom/testbinding.rs
+++ b/components/script/dom/testbinding.rs
@@ -7,6 +7,7 @@
 use dom::bindings::codegen::Bindings::EventListenerBinding::EventListener;
 use dom::bindings::codegen::Bindings::FunctionBinding::Function;
 use dom::bindings::codegen::Bindings::TestBindingBinding::{self, TestBindingMethods, TestEnum};
+use dom::bindings::codegen::UnionTypes::{BlobOrBlobSequence};
 use dom::bindings::codegen::UnionTypes::{BlobOrString, EventOrString};
 use dom::bindings::codegen::UnionTypes::{EventOrUSVString, HTMLElementOrLong};
 use dom::bindings::codegen::UnionTypes::{StringOrLongSequence, StringOrStringSequence};
@@ -191,6 +192,7 @@ impl TestBindingMethods for TestBinding {
     fn ReceiveUnion2(&self) -> EventOrString { EventOrString::eString(DOMString::new()) }
     fn ReceiveUnion3(&self) -> StringOrLongSequence { StringOrLongSequence::eLongSequence(vec![]) }
     fn ReceiveUnion4(&self) -> StringOrStringSequence { StringOrStringSequence::eStringSequence(vec![]) }
+    fn ReceiveUnion5(&self) -> BlobOrBlobSequence { BlobOrBlobSequence::eBlobSequence(vec![]) }
     fn ReceiveSequence(&self) -> Vec<i32> { vec![1] }
     fn ReceiveInterfaceSequence(&self) -> Vec<Root<Blob>> {
         vec![Blob::new(self.global().r(), Vec::new(), "")]
diff --git a/components/script/dom/webidls/TestBinding.webidl b/components/script/dom/webidls/TestBinding.webidl
index 4863b1ce0b0..65ab4cf886c 100644
--- a/components/script/dom/webidls/TestBinding.webidl
+++ b/components/script/dom/webidls/TestBinding.webidl
@@ -151,6 +151,7 @@ interface TestBinding {
   (Event or DOMString) receiveUnion2();
   (DOMString or sequence<long>) receiveUnion3();
   (DOMString or sequence<DOMString>) receiveUnion4();
+  (Blob or sequence<Blob>) receiveUnion5();
   sequence<long> receiveSequence();
   sequence<Blob> receiveInterfaceSequence();