diff --git a/app/services/ldap_service.rb b/app/services/ldap_service.rb
index a286314..91b6dd9 100644
--- a/app/services/ldap_service.rb
+++ b/app/services/ldap_service.rb
@@ -34,14 +34,17 @@ class LdapService < ApplicationService
     client.delete dn: dn
     client.get_operation_result.code
   end
+
+  def delete_all_users!
+    delete_all_entries!(objectclass: "person")
   end
 
-  def delete_all_entries!
+  def delete_all_entries!(objectclass: "*")
     if Rails.env.production?
       raise "Mass deletion of entries not allowed in production"
     end
 
-    filter  = Net::LDAP::Filter.eq("objectClass", "*")
+    filter  = Net::LDAP::Filter.eq("objectClass", objectclass)
     entries = client.search(base: @suffix, filter: filter, attributes: %w{dn})
     entries.sort_by!{ |e| e.dn.length }.reverse!
 
diff --git a/db/seeds.rb b/db/seeds.rb
index fa957a6..4c27d94 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -3,6 +3,8 @@ require 'sidekiq/testing'
 ldap = LdapService.new
 
 Sidekiq::Testing.inline! do
+  ldap.delete_all_users!
+
   CreateAccount.call(account: {
     username: "admin", domain: "kosmos.org", email: "admin@example.com",
     password: "admin is admin", confirmed: true