diff --git a/src/renderers/__tests__/refs-test.js b/src/renderers/__tests__/refs-test.js
index ccdfd418a9..6e4c8141f8 100644
--- a/src/renderers/__tests__/refs-test.js
+++ b/src/renderers/__tests__/refs-test.js
@@ -316,7 +316,6 @@ describe('string refs between fiber and stack', () => {
   });
 
   it('attaches, detaches from fiber component with stack layer', () => {
-    spyOn(console, 'error');
     const ReactCurrentOwner = require('ReactCurrentOwner');
 
     const ReactDOMStack = require('ReactDOMStackEntry');
@@ -353,18 +352,9 @@ describe('string refs between fiber and stack', () => {
     ReactDOMFiber.unmountComponentAtNode(container);
     expect(a.refs.span).toBe(undefined);
     expect(layerMounted).toBe(true);
-    if (!ReactDOMFeatureFlags.useFiber) {
-      expectDev(console.error.calls.count()).toBe(1);
-      expectDev(console.error.calls.argsFor(0)[0]).toBe(
-        'Warning: You are using React DOM Fiber which is an experimental ' +
-          'renderer. It is likely to have bugs, breaking changes and is ' +
-          'unsupported.',
-      );
-    }
   });
 
   it('attaches, detaches from stack component with fiber layer', () => {
-    spyOn(console, 'error');
     const ReactCurrentOwner = require('ReactCurrentOwner');
     const ReactDOM = require('ReactDOMStackEntry');
     const ReactDOMFiber = require('ReactDOMFiberEntry');
@@ -400,14 +390,6 @@ describe('string refs between fiber and stack', () => {
     ReactDOM.unmountComponentAtNode(container);
     expect(a.refs.span).toBe(undefined);
     expect(layerMounted).toBe(true);
-    if (!ReactDOMFeatureFlags.useFiber) {
-      expectDev(console.error.calls.count()).toBe(1);
-      expectDev(console.error.calls.argsFor(0)[0]).toBe(
-        'Warning: You are using React DOM Fiber which is an experimental ' +
-          'renderer. It is likely to have bugs, breaking changes and is ' +
-          'unsupported.',
-      );
-    }
   });
 });
 
diff --git a/src/renderers/dom/fiber/ReactDOMFiberEntry.js b/src/renderers/dom/fiber/ReactDOMFiberEntry.js
index 34c89a537b..72d366fead 100644
--- a/src/renderers/dom/fiber/ReactDOMFiberEntry.js
+++ b/src/renderers/dom/fiber/ReactDOMFiberEntry.js
@@ -454,18 +454,6 @@ ReactGenericBatching.injection.injectFiberBatchedUpdates(
   DOMRenderer.batchedUpdates,
 );
 
-var warned = false;
-
-function warnAboutUnstableUse() {
-  // Ignore this warning is the feature flag is turned on. E.g. for tests.
-  warning(
-    warned || ReactDOMFeatureFlags.useFiber,
-    'You are using React DOM Fiber which is an experimental renderer. ' +
-      'It is likely to have bugs, breaking changes and is unsupported.',
-  );
-  warned = true;
-}
-
 function renderSubtreeIntoContainer(
   parentComponent: ?ReactComponent<any, any, any>,
   children: ReactNodeList,
@@ -588,7 +576,6 @@ var ReactDOMFiber = {
       isValidContainer(container),
       'unmountComponentAtNode(...): Target container is not a DOM element.',
     );
-    warnAboutUnstableUse();
 
     if (container._reactRootContainer) {
       if (__DEV__) {