diff --git a/.smalltalk.ston b/.smalltalk.ston
index 277b43e..92a766e 100644
--- a/.smalltalk.ston
+++ b/.smalltalk.ston
@@ -10,7 +10,8 @@ SmalltalkCISpec {
   
   #testing: {
      #coverage: {
-      #packages: [ 'Presenter-Core' ]
+      #packages: [ 'Presenter-Core' ],
+      #format: #lcov
      }
    }
 }