diff --git a/lib/classes/JsonApi/Routes/Blubber/ThreadsIndex.php b/lib/classes/JsonApi/Routes/Blubber/ThreadsIndex.php
index 74f406962ef874fe83c16fa45be3e6924e131b77..91cfa89210b43d31754fc2a8e19306dfa585d90e 100644
--- a/lib/classes/JsonApi/Routes/Blubber/ThreadsIndex.php
+++ b/lib/classes/JsonApi/Routes/Blubber/ThreadsIndex.php
@@ -77,7 +77,7 @@ class ThreadsIndex extends JsonApiController
     private function getPublicThreads(\User $observer)
     {
         return $this->paginateThreads(
-            $this->upgradeAndFilterThreads($observer, \BlubberThread::findBySQL('context_type = "public"'))
+            $this->upgradeAndFilterThreads($observer, \BlubberThread::findBySQL("context_type = 'public'"))
         );
     }
 
diff --git a/lib/classes/sidebar/RoomSearchWidget.class.php b/lib/classes/sidebar/RoomSearchWidget.class.php
index c1a3d6a856f92571cd868612a1a52ca761f0067c..f12e73ea7a6ce2971997596dba6f4379aba74901 100644
--- a/lib/classes/sidebar/RoomSearchWidget.class.php
+++ b/lib/classes/sidebar/RoomSearchWidget.class.php
@@ -22,7 +22,7 @@ class RoomSearchWidget extends SidebarWidget
             ]
         );
 
-        $resource_categories = ResourceCategory::findBySQL('`class_name` ="Room" ORDER by `name`');
+        $resource_categories = ResourceCategory::findBySQL("class_name = 'Room' ORDER by name");
         $categories = [
             '' => _('Alle Kategorien')
         ];
diff --git a/tests/jsonapi/BlubberThreadsIndexTest.php b/tests/jsonapi/BlubberThreadsIndexTest.php
index ec2929c9071e1c2c4f32b9ef31471a5af910089e..ab6d200fd2ff6b1f15a1f9f208c655a1146c9ea8 100644
--- a/tests/jsonapi/BlubberThreadsIndexTest.php
+++ b/tests/jsonapi/BlubberThreadsIndexTest.php
@@ -58,7 +58,7 @@ class BlubberThreadsIndexTest extends \Codeception\Test\Unit
             return count(
                 $this->upgradeAndFilterThreads(
                     $credentials,
-                    \BlubberThread::findBySQL('context_type = "public" AND visible_in_stream')
+                    \BlubberThread::findBySQL("context_type = 'public' AND visible_in_stream")
                 )
             );
         });