diff --git a/.circleci/config.yml b/.circleci/config.yml
index 4262aedd3e..3e30e1d11a 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -229,7 +229,7 @@ jobs:
           when: always
           command: |
             du -sh /tmp/test_output/*
-            find /tmp/test_output -type f ! -name "pg.log" ! -name "pageserver.log" ! -name "wal_acceptor.log" -delete
+            find /tmp/test_output -type f ! -name "pg.log" ! -name "pageserver.log" ! -name "wal_acceptor.log" ! -name "regression.diffs" -delete
             du -sh /tmp/test_output/*
       - store_artifacts:
           path: /tmp/test_output