diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -5044,6 +5044,7 @@
     'PhabricatorWeekStartDaySetting' => 'applications/settings/setting/PhabricatorWeekStartDaySetting.php',
     'PhabricatorWildConfigType' => 'applications/config/type/PhabricatorWildConfigType.php',
     'PhabricatorWordPressAuthProvider' => 'applications/auth/provider/PhabricatorWordPressAuthProvider.php',
+    'PhabricatorWorkboardInterface' => 'applications/project/interface/PhabricatorWorkboardInterface.php',
     'PhabricatorWorkboardViewState' => 'applications/project/state/PhabricatorWorkboardViewState.php',
     'PhabricatorWorker' => 'infrastructure/daemon/workers/PhabricatorWorker.php',
     'PhabricatorWorkerActiveTask' => 'infrastructure/daemon/workers/storage/PhabricatorWorkerActiveTask.php',
@@ -10748,6 +10749,7 @@
       'PhabricatorColumnProxyInterface',
       'PhabricatorSpacesInterface',
       'PhabricatorEditEngineSubtypeInterface',
+      'PhabricatorWorkboardInterface',
     ),
     'PhabricatorProjectActivityChartEngine' => 'PhabricatorChartEngine',
     'PhabricatorProjectAddHeraldAction' => 'PhabricatorProjectHeraldAction',
diff --git a/src/applications/project/engine/PhabricatorBoardLayoutEngine.php b/src/applications/project/engine/PhabricatorBoardLayoutEngine.php
--- a/src/applications/project/engine/PhabricatorBoardLayoutEngine.php
+++ b/src/applications/project/engine/PhabricatorBoardLayoutEngine.php
@@ -301,6 +301,12 @@
       ->execute();
     $boards = mpull($boards, null, 'getPHID');
 
+    foreach ($boards as $key => $board) {
+      if (!($board instanceof PhabricatorWorkboardInterface)) {
+        unset($boards[$key]);
+      }
+    }
+
     if (!$this->fetchAllBoards) {
       foreach ($boards as $key => $board) {
         if (!$board->getHasWorkboard()) {
diff --git a/src/applications/project/interface/PhabricatorWorkboardInterface.php b/src/applications/project/interface/PhabricatorWorkboardInterface.php
new file mode 100644
--- /dev/null
+++ b/src/applications/project/interface/PhabricatorWorkboardInterface.php
@@ -0,0 +1,3 @@
+<?php
+
+interface PhabricatorWorkboardInterface {}
diff --git a/src/applications/project/storage/PhabricatorProject.php b/src/applications/project/storage/PhabricatorProject.php
--- a/src/applications/project/storage/PhabricatorProject.php
+++ b/src/applications/project/storage/PhabricatorProject.php
@@ -13,7 +13,8 @@
     PhabricatorConduitResultInterface,
     PhabricatorColumnProxyInterface,
     PhabricatorSpacesInterface,
-    PhabricatorEditEngineSubtypeInterface {
+    PhabricatorEditEngineSubtypeInterface,
+    PhabricatorWorkboardInterface {
 
   protected $name;
   protected $status = PhabricatorProjectStatus::STATUS_ACTIVE;