diff --git a/testdata/dsn/mox.conf b/testdata/dsn/mox.conf
index 997512c..e1286db 100644
--- a/testdata/dsn/mox.conf
+++ b/testdata/dsn/mox.conf
@@ -1,4 +1,5 @@
 DataDir: data
+User: 1000
 LogLevel: trace
 Hostname: mox.example
 Postmaster:
diff --git a/testdata/httpaccount/mox.conf b/testdata/httpaccount/mox.conf
index 997512c..e1286db 100644
--- a/testdata/httpaccount/mox.conf
+++ b/testdata/httpaccount/mox.conf
@@ -1,4 +1,5 @@
 DataDir: data
+User: 1000
 LogLevel: trace
 Hostname: mox.example
 Postmaster:
diff --git a/testdata/imap/mox.conf b/testdata/imap/mox.conf
index 1df5357..3ed95b9 100644
--- a/testdata/imap/mox.conf
+++ b/testdata/imap/mox.conf
@@ -1,4 +1,5 @@
 DataDir: data
+User: 1000
 LogLevel: trace
 Hostname: mox.example
 Listeners:
diff --git a/testdata/queue/mox.conf b/testdata/queue/mox.conf
index a62728d..c23f502 100644
--- a/testdata/queue/mox.conf
+++ b/testdata/queue/mox.conf
@@ -1,5 +1,6 @@
 DataDir: data
 LogLevel: trace
+User: 1000
 Hostname: mox.example
 Listeners:
 	local: nil
diff --git a/testdata/smtp/dmarcreport/mox.conf b/testdata/smtp/dmarcreport/mox.conf
index 05879cf..b9062bf 100644
--- a/testdata/smtp/dmarcreport/mox.conf
+++ b/testdata/smtp/dmarcreport/mox.conf
@@ -1,4 +1,5 @@
 DataDir: ../data
+User: 1000
 LogLevel: trace
 Hostname: mox.example
 Postmaster:
diff --git a/testdata/smtp/junk/mox.conf b/testdata/smtp/junk/mox.conf
index 05879cf..b9062bf 100644
--- a/testdata/smtp/junk/mox.conf
+++ b/testdata/smtp/junk/mox.conf
@@ -1,4 +1,5 @@
 DataDir: ../data
+User: 1000
 LogLevel: trace
 Hostname: mox.example
 Postmaster:
diff --git a/testdata/smtp/mox.conf b/testdata/smtp/mox.conf
index 997512c..e1286db 100644
--- a/testdata/smtp/mox.conf
+++ b/testdata/smtp/mox.conf
@@ -1,4 +1,5 @@
 DataDir: data
+User: 1000
 LogLevel: trace
 Hostname: mox.example
 Postmaster:
diff --git a/testdata/smtp/tlsrpt/mox.conf b/testdata/smtp/tlsrpt/mox.conf
index 05879cf..b9062bf 100644
--- a/testdata/smtp/tlsrpt/mox.conf
+++ b/testdata/smtp/tlsrpt/mox.conf
@@ -1,4 +1,5 @@
 DataDir: ../data
+User: 1000
 LogLevel: trace
 Hostname: mox.example
 Postmaster:
diff --git a/testdata/store/mox.conf b/testdata/store/mox.conf
index 997512c..e1286db 100644
--- a/testdata/store/mox.conf
+++ b/testdata/store/mox.conf
@@ -1,4 +1,5 @@
 DataDir: data
+User: 1000
 LogLevel: trace
 Hostname: mox.example
 Postmaster: