diff --git a/config-portable.yaml b/config-portable.yaml
index 0982494..fdcee63 100644
--- a/config-portable.yaml
+++ b/config-portable.yaml
@@ -1,5 +1,6 @@
 parameters:
   custom_target_branch: "a10s-portable"
+  pre_clean: true
 
 actions:
   - run_script: