diff --git a/browser_patches/checkout_build_archive_upload.sh b/browser_patches/checkout_build_archive_upload.sh
index b6b1c7241f..f715b72ce0 100755
--- a/browser_patches/checkout_build_archive_upload.sh
+++ b/browser_patches/checkout_build_archive_upload.sh
@@ -52,7 +52,9 @@ else
 fi
 
 echo "-- preparing checkout"
-./do_checkout.sh $BROWSER_NAME
+# the "do_checkout" script asks if you want to reset existing branch.
+# sure we do!
+yes | ./do_checkout.sh $BROWSER_NAME
 echo "-- building"
 ./$BROWSER_NAME/build.sh
 echo "-- archiving to $ZIP_PATH"