diff --git a/test/common/index.js b/test/common/index.js
index c04cac27bf2eca..c84933fd6eb3b3 100644
--- a/test/common/index.js
+++ b/test/common/index.js
@@ -34,6 +34,14 @@ const {
   hasIntl
 } = process.binding('config');
 
+// Some tests assume a umask of 0o022 so set that up front. Tests that need a
+// different umask will set it themselves.
+//
+// process.umask() is not available in workers so we need to check for its
+// existence.
+if (process.umask)
+  process.umask(0o022);
+
 const noop = () => {};
 
 const hasCrypto = Boolean(process.versions.openssl);