diff --git a/.circleci/config.yml b/.circleci/config.yml
index 287b557239cff17eda72eb8145e31a11479f0b43..e1ac8d0e4924486996bf399b757e8b268bc42a0e 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -130,6 +130,8 @@ jobs:
             # https://support.circleci.com/hc/en-us/articles/360009144794-macOS-resources
             # says "Medium: 4 vCPUs, 8GB RAM".
             venv/bin/python -m twisted.trial --jobs 4 --rterrors _zkapauthorizer
+          environment:
+            ZKAPAUTHORIZER_HYPOTHESIS_PROFILE: "ci"
 
   linux-tests:
     docker: