1 files changed, 7 insertions, 0 deletions
diff --git a/lib/internal/process/methods.js b/lib/internal/process/methods.js
index 91aca398b3..9a954f6a9b 100644
--- a/lib/internal/process/methods.js
+++ b/lib/internal/process/methods.js
@@ -8,11 +8,18 @@ const {
   validateMode,
   validateUint32
 } = require('internal/validators');
+const {
+  isMainThread
+} = require('internal/worker');
 
 function setupProcessMethods(_chdir, _cpuUsage, _hrtime, _memoryUsage,
                              _rawDebug, _umask, _initgroups, _setegid,
                              _seteuid, _setgid, _setuid, _setgroups) {
   // Non-POSIX platforms like Windows don't have certain methods.
+  // Workers also lack these methods since they change process-global state.
+  if (!isMainThread)
+    return;
+
   if (_setgid !== undefined) {
     setupPosixMethods(_initgroups, _setegid, _seteuid,
                       _setgid, _setuid, _setgroups);