diff -u b/src/Tests/FlagFieldEntryTest.php b/src/Tests/FlagFieldEntryTest.php
--- b/src/Tests/FlagFieldEntryTest.php
+++ b/src/Tests/FlagFieldEntryTest.php
@@ -79,6 +79,7 @@
     parent::setUp();
     // The breadcrumb block is needed for FieldUiTestTrait's tests.
     $this->drupalPlaceBlock('system_breadcrumb_block');
+    $this->drupalPlaceBlock('local_tasks_block');
   }
 
   /**
@@ -143,7 +144,7 @@
    */
   public function doAddFields() {
     // Check the Field UI tabs appear on the flag edit page.
-    $this->drupalGet('admin/structure/flags/manage/' . $this->id . '/fields');
+    $this->drupalGet('admin/structure/flags/manage/' . $this->id);
     $this->assertText(t("Manage fields"), "The Field UI tabs appear on the flag edit form page.");
 
     $this->fieldUIAddNewField('admin/structure/flags/manage/' . $this->id, $this->flagFieldId, $this->flagFieldLabel, 'text');