diff --git a/lib/privilege-helpers.js b/lib/privilege-helpers.js
index 708c70bc..07d39844 100644
--- a/lib/privilege-helpers.js
+++ b/lib/privilege-helpers.js
@@ -8,9 +8,9 @@ const fs = require('fs');
 const tryRequire = require('try-require');
 const posix = tryRequire('posix');
 
-function _getConfigUidGid(prefix) {
-    let uid = process.getuid();
-    let gid = process.getgid();
+function _getConfigUidGid(prefix, defaultUid, defaultGid) {
+    let uid = defaultUid;
+    let gid = defaultGid;
 
     if (posix) {
         try {
@@ -36,11 +36,12 @@ function _getConfigUidGid(prefix) {
 }
 
 function getConfigUidGid() {
-    return _getConfigUidGid('');
+    return _getConfigUidGid('', process.getuid(), process.getgid());
 }
 
 function getConfigROUidGid() {
-    return _getConfigUidGid('ro');
+    let rwIds = getConfigUidGid();
+    return _getConfigUidGid('ro', rwIds.uid, rwIds.gid);
 }
 
 function ensureMailtrainOwner(file, callback) {