diff --git a/packages/react-reconciler/src/ReactFiber.js b/packages/react-reconciler/src/ReactFiber.js
index 167e877b919b2..c9af059d20de6 100644
--- a/packages/react-reconciler/src/ReactFiber.js
+++ b/packages/react-reconciler/src/ReactFiber.js
@@ -656,8 +656,8 @@ export function createFiberFromElement(
   mode: TypeOfMode,
   lanes: Lanes,
 ): Fiber {
-  let owner = null;
   let source = null;
+  let owner = null;
   if (__DEV__) {
     source = element._source;
     owner = element._owner;