diff --git a/guam.service b/guam.service
index 591daf3..c21da29 100644
--- a/guam.service
+++ b/guam.service
@@ -1,17 +1,18 @@
 [Unit]
 Description=Intelligent IMAP Reverse Proxy
 After=syslog.target
 
 [Service]
 ExecStart=/usr/sbin/guam foreground
 Restart=always
 StandardOutput=syslog
 SyslogIdentifier=guam
+Environment=HOME=/opt/kolab_guam/
 
 # No proper setuid/setgid in guam yet. See T971.
 #User=guam
 #Group=guam
 
 [Install]
 WantedBy=multi-user.target