diff --git a/cohort/tests/reportbuilder/datasource/cohorts_test.php b/cohort/tests/reportbuilder/datasource/cohorts_test.php
index 777d874f696..e0a92720a12 100644
--- a/cohort/tests/reportbuilder/datasource/cohorts_test.php
+++ b/cohort/tests/reportbuilder/datasource/cohorts_test.php
@@ -135,8 +135,14 @@ class cohorts_test extends core_reportbuilder_testcase {
 
     /**
      * Stress test datasource
+     *
+     * In order to execute this test PHPUNIT_LONGTEST should be defined as true in phpunit.xml or directly in config.php
      */
     public function test_stress_datasource(): void {
+        if (!PHPUNIT_LONGTEST) {
+            $this->markTestSkipped('PHPUNIT_LONGTEST is not defined');
+        }
+
         $this->resetAfterTest();
 
         $cohort = $this->getDataGenerator()->create_cohort();
diff --git a/course/tests/reportbuilder/datasource/courses_test.php b/course/tests/reportbuilder/datasource/courses_test.php
index 51a47a16f0c..fc450c15239 100644
--- a/course/tests/reportbuilder/datasource/courses_test.php
+++ b/course/tests/reportbuilder/datasource/courses_test.php
@@ -108,8 +108,14 @@ class courses_test extends core_reportbuilder_testcase {
 
     /**
      * Stress test datasource
+     *
+     * In order to execute this test PHPUNIT_LONGTEST should be defined as true in phpunit.xml or directly in config.php
      */
     public function test_stress_datasource(): void {
+        if (!PHPUNIT_LONGTEST) {
+            $this->markTestSkipped('PHPUNIT_LONGTEST is not defined');
+        }
+
         $this->resetAfterTest();
 
         /** @var core_customfield_generator $generator */
diff --git a/user/tests/reportbuilder/datasource/users_test.php b/user/tests/reportbuilder/datasource/users_test.php
index cd8ba2483c4..6c3a658511f 100644
--- a/user/tests/reportbuilder/datasource/users_test.php
+++ b/user/tests/reportbuilder/datasource/users_test.php
@@ -37,8 +37,14 @@ class users_test extends core_reportbuilder_testcase {
 
     /**
      * Stress test datasource
+     *
+     * In order to execute this test PHPUNIT_LONGTEST should be defined as true in phpunit.xml or directly in config.php
      */
     public function test_stress_datasource(): void {
+        if (!PHPUNIT_LONGTEST) {
+            $this->markTestSkipped('PHPUNIT_LONGTEST is not defined');
+        }
+
         $this->resetAfterTest();
 
         $this->getDataGenerator()->create_custom_profile_field(['datatype' => 'text', 'name' => 'Hi', 'shortname' => 'hi']);