diff --git a/src/parseExpensiMark.ts b/src/parseExpensiMark.ts
index f4291eb3..673734af 100644
--- a/src/parseExpensiMark.ts
+++ b/src/parseExpensiMark.ts
@@ -12,7 +12,7 @@ function isWeb() {
 }
 
 function isJest() {
-  return !!process.env.JEST_WORKER_ID;
+  return !!global.process.env.JEST_WORKER_ID;
 }
 
 // eslint-disable-next-line no-underscore-dangle