diff --git a/server/conf/vhost.conf.master b/server/conf/vhost.conf.master
index 857a87b52eeaccd39eccdffbf3029fe395448539..950e8f0ed84012e9387c33525e20f773851355b3 100644
--- a/server/conf/vhost.conf.master
+++ b/server/conf/vhost.conf.master
@@ -138,6 +138,11 @@
 </tmpl_loop>
 </tmpl_if>
 
+    # add support for apache mpm_itk
+    <IfModule mpm_itk_module>
+      AssignUserId <tmpl_var name='system_user'> <tmpl_var name='system_group'>
+    </IfModule>
+
 <tmpl_var name='apache_directives'>
 </VirtualHost>
 
@@ -291,6 +296,11 @@
 </tmpl_loop>
 </tmpl_if>
 
+    # add support for apache mpm_itk
+    <IfModule mpm_itk_module>
+      AssignUserId <tmpl_var name='system_user'> <tmpl_var name='system_group'>
+    </IfModule>
+
 <tmpl_var name='apache_directives'>
 </VirtualHost>
 </IfModule>