1 files changed, 1 insertions, 1 deletions
diff --git a/src/timer.ts b/src/timer.ts
index 2fc2ade04..dd67dbd29 100644
--- a/src/timer.ts
+++ b/src/timer.ts
@@ -50,7 +50,7 @@ class TimeoutHandle {
  * Get a performance counter in milliseconds.
  */
 export let performanceNow = (() => {
-  if (typeof "process" !== "undefined") {
+  if (typeof process !== "undefined" && process.hrtime) {
     return () => {
       const t = process.hrtime();
       return t[0] * 1e9 + t[1];