diff --git a/packages/cra-template-typescript/template/src/reportWebVitals.ts b/packages/cra-template-typescript/template/src/reportWebVitals.ts
index 49a2a16e0fb..cfad7f02ee9 100644
--- a/packages/cra-template-typescript/template/src/reportWebVitals.ts
+++ b/packages/cra-template-typescript/template/src/reportWebVitals.ts
@@ -1,7 +1,7 @@
 import { ReportHandler } from 'web-vitals';
 
 const reportWebVitals = (onPerfEntry?: ReportHandler) => {
-  if (onPerfEntry && onPerfEntry instanceof Function) {
+  if (onPerfEntry) {
     import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
       getCLS(onPerfEntry);
       getFID(onPerfEntry);
diff --git a/packages/cra-template/template/src/reportWebVitals.js b/packages/cra-template/template/src/reportWebVitals.js
index 5253d3ad9e6..1904807f478 100644
--- a/packages/cra-template/template/src/reportWebVitals.js
+++ b/packages/cra-template/template/src/reportWebVitals.js
@@ -1,5 +1,5 @@
 const reportWebVitals = onPerfEntry => {
-  if (onPerfEntry && onPerfEntry instanceof Function) {
+  if (onPerfEntry) {
     import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
       getCLS(onPerfEntry);
       getFID(onPerfEntry);