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
@@ -2190,7 +2190,6 @@
     'PhabricatorProjectMembersEditController' => 'applications/project/controller/PhabricatorProjectMembersEditController.php',
     'PhabricatorProjectMembersRemoveController' => 'applications/project/controller/PhabricatorProjectMembersRemoveController.php',
     'PhabricatorProjectMoveController' => 'applications/project/controller/PhabricatorProjectMoveController.php',
-    'PhabricatorProjectNameCollisionException' => 'applications/project/exception/PhabricatorProjectNameCollisionException.php',
     'PhabricatorProjectObjectHasProjectEdgeType' => 'applications/project/edge/PhabricatorProjectObjectHasProjectEdgeType.php',
     'PhabricatorProjectOrUserDatasource' => 'applications/project/typeahead/PhabricatorProjectOrUserDatasource.php',
     'PhabricatorProjectProfileController' => 'applications/project/controller/PhabricatorProjectProfileController.php',
@@ -5390,7 +5389,6 @@
     'PhabricatorProjectMembersEditController' => 'PhabricatorProjectController',
     'PhabricatorProjectMembersRemoveController' => 'PhabricatorProjectController',
     'PhabricatorProjectMoveController' => 'PhabricatorProjectController',
-    'PhabricatorProjectNameCollisionException' => 'Exception',
     'PhabricatorProjectObjectHasProjectEdgeType' => 'PhabricatorEdgeType',
     'PhabricatorProjectOrUserDatasource' => 'PhabricatorTypeaheadCompositeDatasource',
     'PhabricatorProjectProfileController' => 'PhabricatorProjectController',
diff --git a/src/applications/project/exception/PhabricatorProjectNameCollisionException.php b/src/applications/project/exception/PhabricatorProjectNameCollisionException.php
deleted file mode 100644
--- a/src/applications/project/exception/PhabricatorProjectNameCollisionException.php
+++ /dev/null
@@ -1,7 +0,0 @@
-<?php
-
-/**
- * Thrown when you try to save a project with a name too similar to another
- * project.
- */
-final class PhabricatorProjectNameCollisionException extends Exception {}