diff --git a/src/Benzina/ProjectsPump.php b/src/Benzina/ProjectsPump.php
index 927b1a3..8726783 100644
--- a/src/Benzina/ProjectsPump.php
+++ b/src/Benzina/ProjectsPump.php
@@ -402,6 +402,7 @@ class ProjectsPump implements PumpInterface
             $collaboration->setFulfilled($fulfilled);
 
             $collaborations[] = $collaboration;
+            $project->addCollaboration($collaboration);
         }
 
         return $collaborations;