diff --git a/apps/dav/lib/CalDAV/CalDavBackend.php b/apps/dav/lib/CalDAV/CalDavBackend.php
index c99689619d81e73e4247befb5f1793edd304443e..84ec8433a83381fb1739ad585558257a30acae1a 100644
--- a/apps/dav/lib/CalDAV/CalDavBackend.php
+++ b/apps/dav/lib/CalDAV/CalDavBackend.php
@@ -152,7 +152,7 @@ class CalDavBackend extends AbstractBackend implements SyncSupport, Subscription
 			$query->andWhere($query->expr()->neq('uri', $query->createNamedParameter(BirthdayService::BIRTHDAY_CALENDAR_URI)));
 		}
 
-		return $query->execute()->fetchColumn();
+		return (int)$query->execute()->fetchColumn();
 	}
 
 	/**
diff --git a/apps/dav/lib/CardDAV/CardDavBackend.php b/apps/dav/lib/CardDAV/CardDavBackend.php
index 48e3b04b38bdb7b99b4ac7e6f3aa270f9af7a2dc..b8491c08ff6d02d161e11b6b59449f719f3739bc 100644
--- a/apps/dav/lib/CardDAV/CardDavBackend.php
+++ b/apps/dav/lib/CardDAV/CardDavBackend.php
@@ -111,7 +111,7 @@ class CardDavBackend implements BackendInterface, SyncSupport {
 			->from('addressbooks')
 			->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));
 
-		return $query->execute()->fetchColumn();
+		return (int)$query->execute()->fetchColumn();
 	}
 
 	/**