diff --git a/packages/relay-test-utils-internal/index.js b/packages/relay-test-utils-internal/index.js
index 078bfb8905857..0111a7c86c1c0 100644
--- a/packages/relay-test-utils-internal/index.js
+++ b/packages/relay-test-utils-internal/index.js
@@ -49,7 +49,7 @@ function cannotReadPropertyOfUndefined__DEPRECATED(
   propertyName: string,
 ): string {
   const matches = process.version.match(/^v(\d+)\./);
-  const majorVersion = matches == null ? null : parseInt(matches[0], 10);
+  const majorVersion = matches == null ? null : parseInt(matches[1], 10);
   if (majorVersion == null || majorVersion < 16) {
     return `Cannot read property '${propertyName}' of undefined`;
   }