diff --git a/.smalltalk.ston b/.smalltalk.ston
index 4905f3d..c77b696 100644
--- a/.smalltalk.ston
+++ b/.smalltalk.ston
@@ -3,6 +3,7 @@ SmalltalkCISpec {
     SCIMetacelloLoadSpec {
       #baseline : 'ToploSerialization',
       #directory : 'src',
+      #onConflict : #useLoaded,
       #platforms : [ #pharo ]
     }
   ]