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
@@ -573,7 +573,7 @@
 
   public function getDisplayColor() {
     if ($this->isMilestone()) {
-      return PhabricatorProjectIconSet::getDefaultColorKey();
+      return $this->getParentProject()->getColor();
     }
 
     return $this->getColor();