diff --git a/src/workerd/api/blob.h b/src/workerd/api/blob.h
index 8d22fd0d35c..9fd0c9fc682 100644
--- a/src/workerd/api/blob.h
+++ b/src/workerd/api/blob.h
@@ -67,6 +67,7 @@ class Blob: public jsg::Object {
 
     JSG_TS_OVERRIDE({
       bytes(): Promise<Uint8Array>;
+      arrayBuffer(): Promise<ArrayBuffer>;
     });
   }
 
diff --git a/src/workerd/api/http.h b/src/workerd/api/http.h
index 3ecc5b926cb..b1d90f8b8fc 100644
--- a/src/workerd/api/http.h
+++ b/src/workerd/api/http.h
@@ -384,6 +384,7 @@ class Body: public jsg::Object {
     JSG_TS_OVERRIDE({
       json<T>(): Promise<T>;
       bytes(): Promise<Uint8Array>;
+      arrayBuffer(): Promise<ArrayBuffer>;
     });
     // Allow JSON body type to be specified
   }
diff --git a/src/workerd/api/r2-bucket.h b/src/workerd/api/r2-bucket.h
index d3a2cecd6fc..e6772e0f491 100644
--- a/src/workerd/api/r2-bucket.h
+++ b/src/workerd/api/r2-bucket.h
@@ -382,6 +382,7 @@ class R2Bucket: public jsg::Object {
       JSG_METHOD(blob);
       JSG_TS_OVERRIDE(R2ObjectBody {
         json<T>(): Promise<T>;
+        arrayBuffer(): Promise<ArrayBuffer>;
       });
     }