diff --git a/tool/.travis.sh b/tool/.travis.sh
index 3589420a..014ab75f 100644
--- a/tool/.travis.sh
+++ b/tool/.travis.sh
@@ -12,7 +12,7 @@ function angel_orm_test () {
 
 cd angel_orm_generator;
 pub get;
-echo 1 | pub run build_runner build;
+echo 1 | pub run build_runner build --delete-conflicting-outputs;
 cd ..;
 angel_orm_test angel_orm_postgres
 angel_orm_test angel_orm_service