diff --git a/packages/react-dom/src/client/ReactDOM.js b/packages/react-dom/src/client/ReactDOM.js
index 74744384aca..e13fc602195 100644
--- a/packages/react-dom/src/client/ReactDOM.js
+++ b/packages/react-dom/src/client/ReactDOM.js
@@ -81,7 +81,7 @@ if (__DEV__) {
     warning(
       false,
       'React depends on Map and Set built-in types. Make sure that you load a ' +
-        'polyfill in older browsers. http://fb.me/react-polyfills',
+        'polyfill in older browsers. https://fb.me/react-polyfills',
     );
   }
 }
diff --git a/packages/shared/ReactDOMFrameScheduling.js b/packages/shared/ReactDOMFrameScheduling.js
index f50e0ed204c..af5f6d646d9 100644
--- a/packages/shared/ReactDOMFrameScheduling.js
+++ b/packages/shared/ReactDOMFrameScheduling.js
@@ -28,7 +28,7 @@ if (__DEV__) {
     warning(
       false,
       'React depends on requestAnimationFrame. Make sure that you load a ' +
-        'polyfill in older browsers. http://fb.me/react-polyfills',
+        'polyfill in older browsers. https://fb.me/react-polyfills',
     );
   }
 }