diff --git a/.circleci/config.yml b/.circleci/config.yml
index ca210b4..8c41251 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -16,7 +16,7 @@ jobs:
       - checkout
       - run:
           name: Trunk check
-          command: ./trunk check
+          command: ./trunk check --upstream=${PR_BASE_REF:--remotes/origin/${CIRCLE_BRANCH}}
 
 workflows:
   ctest: