diff --git a/types/slate-react/index.d.ts b/types/slate-react/index.d.ts
index 2e04b32168..10bf3fcfdb 100644
--- a/types/slate-react/index.d.ts
+++ b/types/slate-react/index.d.ts
@@ -114,12 +114,18 @@ export interface Plugin extends CorePlugin {
 export type PluginOrPlugins = Plugin | Plugins;
 export interface Plugins extends Array<PluginOrPlugins> {}
 
+export interface OnChangeParam {
+    operations: Immutable.List<Operation>;
+    value: Value;
+}
+export type OnChangeFn = (change: OnChangeParam) => any;
+
 export interface BasicEditorProps {
     value: Value;
     autoCorrect?: boolean;
     autoFocus?: boolean;
     className?: string;
-    onChange?: (change: { operations: Immutable.List<Operation>; value: Value }) => any;
+    onChange?: OnChangeFn;
     placeholder?: any;
     plugins?: Plugins;
     readOnly?: boolean;
diff --git a/types/slate-react/slate-react-tests.tsx b/types/slate-react/slate-react-tests.tsx
index f49a6ffefa..b236728ce2 100644
--- a/types/slate-react/slate-react-tests.tsx
+++ b/types/slate-react/slate-react-tests.tsx
@@ -1,15 +1,14 @@
-import { Editor, Plugin, EditorProps, RenderBlockProps, RenderInlineProps } from "slate-react";
-import { Value, Editor as Controller, Operation, Point, Range, Inline, Mark, Document, Decoration } from "slate";
+import { Editor, Plugin, EditorProps, OnChangeFn, RenderBlockProps, RenderInlineProps } from 'slate-react';
+import { Value, Editor as Controller, Point, Range, Inline, Mark, Document, Decoration } from 'slate';
 import * as React from "react";
-import * as Immutable from "immutable";
 
 class MyPlugin implements Plugin {
     renderBlock(props: RenderBlockProps, editor: Controller, next: () => void) {
         const { node } = props;
         if (node) {
             switch (node.object) {
-                case "block":
-                    return <div id="slate-block-test"/>;
+                case 'block':
+                    return <div id="slate-block-test" />;
                 default:
                     return undefined;
             }
@@ -19,15 +18,15 @@ class MyPlugin implements Plugin {
         const { node } = props;
         if (node) {
             switch (node.object) {
-                case "inline":
+                case 'inline':
                     return <span id="slate-inline-test">Hello world</span>;
                 default:
                     return undefined;
             }
         }
     }
-    onChange = (change: {operations: Immutable.List<Operation>, value: Value}) => {
-        console.log(change.value);
+    onChange: OnChangeFn = ({ operations, value }) => {
+        console.log(operations, value);
     }
 }