diff --git a/mongodb/index.d.ts b/mongodb/index.d.ts
index 27baabc09c..c37bac86cd 100644
--- a/mongodb/index.d.ts
+++ b/mongodb/index.d.ts
@@ -1223,7 +1223,7 @@ export interface EndCallback {
 //http://mongodb.github.io/node-mongodb-native/2.1/api/AggregationCursor.html#~resultCallback
 export type AggregationCursorResult = any | void;
 //http://mongodb.github.io/node-mongodb-native/2.1/api/AggregationCursor.html
-export interface AggregationCursor<T> extends Readable {
+export class AggregationCursor<T> extends Readable {
     // http://mongodb.github.io/node-mongodb-native/2.1/api/AggregationCursor.html#batchSize
     batchSize(value: number): AggregationCursor<T>;
     // http://mongodb.github.io/node-mongodb-native/2.1/api/AggregationCursor.html#clone
@@ -1275,7 +1275,7 @@ export interface AggregationCursor<T> extends Readable {
 }
 
 //http://mongodb.github.io/node-mongodb-native/2.1/api/CommandCursor.html
-export interface CommandCursor extends Readable {
+export class CommandCursor extends Readable {
     // http://mongodb.github.io/node-mongodb-native/2.1/api/CommandCursor.html#batchSize
     batchSize(value: number): CommandCursor;
     // http://mongodb.github.io/node-mongodb-native/2.1/api/CommandCursor.html#clone