diff --git a/packages/react-reconciler/src/ReactFiberClassComponent.js b/packages/react-reconciler/src/ReactFiberClassComponent.js
index 679c791bd5da2..3f811c11088a3 100644
--- a/packages/react-reconciler/src/ReactFiberClassComponent.js
+++ b/packages/react-reconciler/src/ReactFiberClassComponent.js
@@ -370,7 +370,6 @@ export default function(
       if (
         typeof instance.getSnapshotBeforeUpdate === 'function' &&
         typeof instance.componentDidUpdate !== 'function' &&
-        typeof instance.componentDidUpdate !== 'function' &&
         !didWarnAboutGetSnapshotBeforeUpdateWithoutDidUpdate.has(type)
       ) {
         didWarnAboutGetSnapshotBeforeUpdateWithoutDidUpdate.add(type);