diff --git a/src/applications/people/customfield/PhabricatorUserStatusField.php b/src/applications/people/customfield/PhabricatorUserStatusField.php
index 0b624706e0..5ea28c84d0 100644
--- a/src/applications/people/customfield/PhabricatorUserStatusField.php
+++ b/src/applications/people/customfield/PhabricatorUserStatusField.php
@@ -21,6 +21,11 @@ final class PhabricatorUserStatusField
     return true;
   }
 
+  public function isFieldEnabled() {
+    return PhabricatorApplication::isClassInstalled(
+      'PhabricatorApplicationCalendar');
+  }
+
   public function renderPropertyViewValue(array $handles) {
     $user = $this->getObject();
     $viewer = $this->requireViewer();