diff --git a/farm.install b/farm.install
index 1f48a667..142d6521 100644
--- a/farm.install
+++ b/farm.install
@@ -55,6 +55,14 @@ function farm_install_modules(array &$install_state) {
   // the \Drupal\farm\Form\FarmModulesForm submit method.
   $modules = \Drupal::state()->get('farm.install_modules') ?: [];
 
+  // If this is running in the context of a functional test, do not install any
+  // additional modules. This is a temporary hack.
+  // @see Drupal\Tests\farm\Functional\FarmBrowserTestBase::setUp()
+  // @todo https://www.drupal.org/project/farm/issues/3183739
+  if (!empty($GLOBALS['farm_test'])) {
+    $modules = [];
+  }
+
   // Load a list of all available modules, so that we can display their names.
   $module_handler = \Drupal::service('module_handler');
 
diff --git a/tests/src/Functional/FarmBrowserTestBase.php b/tests/src/Functional/FarmBrowserTestBase.php
index 2240a7f8..72a9cb25 100644
--- a/tests/src/Functional/FarmBrowserTestBase.php
+++ b/tests/src/Functional/FarmBrowserTestBase.php
@@ -13,4 +13,19 @@ class FarmBrowserTestBase extends BrowserTestBase {
    * {@inheritdoc}
    */
   protected $profile = 'farm';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
+
+    // Set a global farm_test variable and then delegate to the parent setUp().
+    // This is a temporary hack to prevent optional default farmOS modules from
+    // being installed via the profile's hook_install_tasks().
+    // @see farm_install_modules()
+    // @todo https://www.drupal.org/project/farm/issues/3183739
+    $GLOBALS['farm_test'] = TRUE;
+    parent::setUp();
+  }
+
 }