diff --git a/modules/monitoring/library/Monitoring/Backend/Ido/Query/EventhistoryQuery.php b/modules/monitoring/library/Monitoring/Backend/Ido/Query/EventhistoryQuery.php
index e14fc6e86..c9acd16fc 100644
--- a/modules/monitoring/library/Monitoring/Backend/Ido/Query/EventhistoryQuery.php
+++ b/modules/monitoring/library/Monitoring/Backend/Ido/Query/EventhistoryQuery.php
@@ -9,7 +9,7 @@ use Icinga\Data\Filter\Filter;
 /**
  * Query for event history records
  */
-class EventHistoryQuery extends IdoQuery
+class EventhistoryQuery extends IdoQuery
 {
     /**
      * {@inheritdoc}
diff --git a/modules/monitoring/library/Monitoring/Backend/Ido/Query/GroupsummaryQuery.php b/modules/monitoring/library/Monitoring/Backend/Ido/Query/GroupsummaryQuery.php
index da33c2bc6..9ed526d79 100644
--- a/modules/monitoring/library/Monitoring/Backend/Ido/Query/GroupsummaryQuery.php
+++ b/modules/monitoring/library/Monitoring/Backend/Ido/Query/GroupsummaryQuery.php
@@ -8,7 +8,7 @@ use Zend_Db_Select;
 /**
  * Query for host and service group summaries
  */
-class GroupSummaryQuery extends IdoQuery
+class GroupsummaryQuery extends IdoQuery
 {
     /**
      * {@inheritdoc}
diff --git a/modules/monitoring/library/Monitoring/Backend/Ido/Query/StatussummaryQuery.php b/modules/monitoring/library/Monitoring/Backend/Ido/Query/StatussummaryQuery.php
index 9d94e8149..e138a3f5e 100644
--- a/modules/monitoring/library/Monitoring/Backend/Ido/Query/StatussummaryQuery.php
+++ b/modules/monitoring/library/Monitoring/Backend/Ido/Query/StatussummaryQuery.php
@@ -10,7 +10,7 @@ use Icinga\Data\Filter\Filter;
 /**
  * Query for host and service status summary
  */
-class StatusSummaryQuery extends IdoQuery
+class StatussummaryQuery extends IdoQuery
 {
     /**
      * {@inheritdoc}