diff --git a/src/applications/project/query/PhabricatorProjectQuery.php b/src/applications/project/query/PhabricatorProjectQuery.php
--- a/src/applications/project/query/PhabricatorProjectQuery.php
+++ b/src/applications/project/query/PhabricatorProjectQuery.php
@@ -656,6 +656,11 @@
     if ($this->memberPHIDs || $this->watcherPHIDs || $this->nameTokens) {
       return true;
     }
+
+    if ($this->slugs) {
+      return true;
+    }
+
     return parent::shouldGroupQueryResultRows();
   }