diff --git a/admin/tool/log/tests/manager_test.php b/admin/tool/log/tests/manager_test.php
index 8949f004fcf..6fb1a90b240 100644
--- a/admin/tool/log/tests/manager_test.php
+++ b/admin/tool/log/tests/manager_test.php
@@ -50,5 +50,22 @@ class tool_log_manager_testcase extends advanced_testcase {
             $this->assertInternalType('string', $key);
             $this->assertInstanceOf('core\log\reader', $store);
         }
+
+        $stores = $manager->get_readers('core\log\sql_reader');
+        $this->assertInternalType('array', $stores);
+        $this->assertCount(1, $stores);
+        foreach ($stores as $key => $store) {
+            $this->assertInternalType('string', $key);
+            $this->assertSame('logstore_standard', $key);
+            $this->assertInstanceOf('core\log\sql_reader', $store);
+        }
+
+        $stores = $manager->get_readers('core\log\reader');
+        $this->assertInternalType('array', $stores);
+        $this->assertCount(2, $stores);
+        foreach ($stores as $key => $store) {
+            $this->assertInternalType('string', $key);
+            $this->assertInstanceOf('core\log\reader', $store);
+        }
     }
 }
diff --git a/lib/classes/log/dummy_manager.php b/lib/classes/log/dummy_manager.php
index cbfb2fab535..818e9ba2fea 100644
--- a/lib/classes/log/dummy_manager.php
+++ b/lib/classes/log/dummy_manager.php
@@ -28,7 +28,7 @@ namespace core\log;
 defined('MOODLE_INTERNAL') || die();
 
 class dummy_manager implements manager {
-    public function get_readers() {
+    public function get_readers($interface = null) {
         return array();
     }