diff --git a/postinst b/postinst
index 85e3117..a450116 100755
--- a/postinst
+++ b/postinst
@@ -1,9 +1,12 @@
 #!/bin/sh
 
 # create the mattermost user and database
-su postgres -c 'createdb mattermost'
 su postgres -c 'createuser mmuser'
 
+# not sure this or the other one works
+# su postgres -c 'createdb mattermost'
+su postgres -c 'createdb -O mmuser mattermost'
+
 echo
 echo systemctl status mattermost.service
 echo