diff --git a/packages/next/src/client/index.tsx b/packages/next/src/client/index.tsx
index dc5ba991c6450..f830642717c2f 100644
--- a/packages/next/src/client/index.tsx
+++ b/packages/next/src/client/index.tsx
@@ -496,8 +496,8 @@ function markHydrateComplete(): void {
     if (
       process.env.NODE_ENV === 'development' &&
       // Old versions of Safari don't return `PerformanceMeasure`s from `performance.measure()`
-      beforeHydrationMeasure !== undefined &&
-      hydrationMeasure !== undefined
+      beforeHydrationMeasure &&
+      hydrationMeasure
     ) {
       tracer
         .startSpan('navigation-to-hydration', {