diff --git a/lib/db_ido/dbconnection.ti b/lib/db_ido/dbconnection.ti
index cf922bd79..61b92b8cc 100644
--- a/lib/db_ido/dbconnection.ti
+++ b/lib/db_ido/dbconnection.ti
@@ -31,7 +31,7 @@ abstract class DbConnection : ConfigObject
 		default {{{ return "icinga_"; }}}
 	};
 
-	[config] Dictionary::Ptr cleanup {
+	[config, required] Dictionary::Ptr cleanup {
 		default {{{ return new Dictionary(); }}}
 	};
 
diff --git a/lib/icinga/host.ti b/lib/icinga/host.ti
index ccf730322..fcc035868 100644
--- a/lib/icinga/host.ti
+++ b/lib/icinga/host.ti
@@ -32,7 +32,7 @@ class Host : Checkable
 	load_after Endpoint;
 	load_after Zone;
 
-	[config, no_user_modify] array(name(HostGroup)) groups {
+	[config, no_user_modify, required] array(name(HostGroup)) groups {
 		default {{{ return new Array(); }}}
 	};
 
diff --git a/lib/icinga/service.ti b/lib/icinga/service.ti
index a97cf67bb..d0c3da685 100644
--- a/lib/icinga/service.ti
+++ b/lib/icinga/service.ti
@@ -44,7 +44,7 @@ class Service : Checkable < ServiceNameComposer
 	load_after Host;
 	load_after Zone;
 
-	[config, no_user_modify] array(name(ServiceGroup)) groups {
+	[config, no_user_modify, required] array(name(ServiceGroup)) groups {
 		default {{{ return new Array(); }}}
 	};
 
diff --git a/lib/icinga/timeperiod.ti b/lib/icinga/timeperiod.ti
index b1087531a..4d289c28a 100644
--- a/lib/icinga/timeperiod.ti
+++ b/lib/icinga/timeperiod.ti
@@ -40,10 +40,10 @@ class TimePeriod : CustomVarObject
 	[config] bool prefer_includes {
 		default {{{ return true; }}}
 	};
-	[config] array(name(TimePeriod)) excludes {
+	[config, required] array(name(TimePeriod)) excludes {
 		default {{{ return new Array(); }}}
 	};
-	[config] array(name(TimePeriod)) includes {
+	[config, required] array(name(TimePeriod)) includes {
 		default {{{ return new Array(); }}}
 	};
 	[state, no_user_modify] Value valid_begin;
diff --git a/lib/icinga/user.ti b/lib/icinga/user.ti
index 5fe86b672..5bf4d4124 100644
--- a/lib/icinga/user.ti
+++ b/lib/icinga/user.ti
@@ -36,7 +36,7 @@ class User : CustomVarObject
 				return m_DisplayName;
 		}}}
 	};
-	[config, no_user_modify] array(name(UserGroup)) groups {
+	[config, no_user_modify, required] array(name(UserGroup)) groups {
 		default {{{ return new Array(); }}}
 	};
 	[config, navigation] name(TimePeriod) period (PeriodRaw) {