diff --git a/lib/classes/context/module.php b/lib/classes/context/module.php
index e1db534868f..6322a34cbb9 100644
--- a/lib/classes/context/module.php
+++ b/lib/classes/context/module.php
@@ -170,15 +170,7 @@ class module extends context {
         $subcaps = array();
 
         $modulepath = "{$CFG->dirroot}/mod/{$module->name}";
-        if (file_exists("{$modulepath}/db/subplugins.json")) {
-            $subplugins = (array) json_decode(file_get_contents("{$modulepath}/db/subplugins.json"))->plugintypes;
-        } else if (file_exists("{$modulepath}/db/subplugins.php")) {
-            debugging('Use of subplugins.php has been deprecated. ' .
-                'Please update your plugin to provide a subplugins.json file instead.',
-                DEBUG_DEVELOPER);
-            $subplugins = array();  // Should be redefined in the file.
-            include("{$modulepath}/db/subplugins.php");
-        }
+        $subplugins = \core\component::get_subplugins("mod_{$module->name}");
 
         if (!empty($subplugins)) {
             foreach (array_keys($subplugins) as $subplugintype) {
diff --git a/lib/tests/context/module_test.php b/lib/tests/context/module_test.php
index 033d3ea895b..6aadffaa06b 100644
--- a/lib/tests/context/module_test.php
+++ b/lib/tests/context/module_test.php
@@ -189,13 +189,16 @@ class module_test extends \advanced_testcase {
         $this->resetAfterTest();
 
         $course = $this->getDataGenerator()->create_course();
-        $page = $this->getDataGenerator()->create_module('page', ['course' => $course->id, 'name' => 'Pokus']);
-        $context = module::instance($page->cmid);
+        $mod = $this->getDataGenerator()->create_module('book', ['course' => $course->id, 'name' => 'Pokus']);
+        $context = module::instance($mod->cmid);
 
         $capabilities = $context->get_capabilities();
         $capabilities = convert_to_array($capabilities);
         $capabilities = array_column($capabilities, 'name');
-        $this->assertContains('mod/page:view', $capabilities);
+
+        $this->assertContains('mod/book:read', $capabilities);
+        $this->assertContains('booktool/exportimscp:export', $capabilities);
+        $this->assertContains('booktool/importhtml:import', $capabilities);
         $this->assertNotContains('mod/url:view', $capabilities);
         $this->assertNotContains('moodle/course:view', $capabilities);
         $this->assertNotContains('moodle/category:manage', $capabilities);