diff --git a/packages/e2e-test-utils-playwright/src/metrics/index.ts b/packages/e2e-test-utils-playwright/src/metrics/index.ts
index a00748d02bd8d6..a2ce9830a199f3 100644
--- a/packages/e2e-test-utils-playwright/src/metrics/index.ts
+++ b/packages/e2e-test-utils-playwright/src/metrics/index.ts
@@ -161,11 +161,11 @@ export class Metrics {
 
 			const firstPaintStartTime = paintTimings.find(
 				( { name } ) => name === 'first-paint'
-			)?.startTime as number;
+			)!.startTime;
 
 			const firstContentfulPaintStartTime = paintTimings.find(
 				( { name } ) => name === 'first-contentful-paint'
-			)?.startTime as number;
+			)!.startTime;
 
 			return {
 				// Server side metric.