diff --git a/components/script/body.rs b/components/script/body.rs
index 21c4d49b58c..435f755aa07 100644
--- a/components/script/body.rs
+++ b/components/script/body.rs
@@ -27,7 +27,8 @@ pub enum BodyType {
     Blob,
     FormData,
     Json,
-    Text
+    Text,
+    ArrayBuffer
 }
 
 pub enum FetchedData {
diff --git a/components/script/dom/request.rs b/components/script/dom/request.rs
index 85998533ae9..b3bb2f1afe1 100644
--- a/components/script/dom/request.rs
+++ b/components/script/dom/request.rs
@@ -611,6 +611,12 @@ impl RequestMethods for Request {
     fn Json(&self) -> Rc<Promise> {
         consume_body(self, BodyType::Json)
     }
+
+    #[allow(unrooted_must_root)]
+    // https://fetch.spec.whatwg.org/#dom-body-arraybuffer
+    fn ArrayBuffer(&self) -> Rc<Promise> {
+        consume_body(self, BodyType::ArrayBuffer)
+    }
 }
 
 impl BodyOperations for Request {
diff --git a/components/script/dom/response.rs b/components/script/dom/response.rs
index e4af7f48187..ff806a5bf8f 100644
--- a/components/script/dom/response.rs
+++ b/components/script/dom/response.rs
@@ -354,6 +354,12 @@ impl ResponseMethods for Response {
     fn Json(&self) -> Rc<Promise> {
         consume_body(self, BodyType::Json)
     }
+
+    #[allow(unrooted_must_root)]
+    // https://fetch.spec.whatwg.org/#dom-body-arraybuffer
+    fn ArrayBuffer(&self) -> Rc<Promise> {
+        consume_body(self, BodyType::ArrayBuffer)
+    }
 }
 
 fn serialize_without_fragment(url: &ServoUrl) -> &str {
diff --git a/components/script/dom/webidls/Body.webidl b/components/script/dom/webidls/Body.webidl
index bb7aa5c6859..1ea45746e73 100644
--- a/components/script/dom/webidls/Body.webidl
+++ b/components/script/dom/webidls/Body.webidl
@@ -10,7 +10,7 @@
 interface Body {
   readonly attribute boolean bodyUsed;
 
-  // [NewObject] Promise<ArrayBuffer> arrayBuffer();
+  [NewObject] Promise<ArrayBuffer> arrayBuffer();
   [NewObject] Promise<Blob> blob();
   [NewObject] Promise<FormData> formData();
   [NewObject] Promise<any> json();