diff --git a/.circleci/config.yml b/.circleci/config.yml
index 78d9c852..1c30019b 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -136,7 +136,7 @@ workflows:
              - build_node_14
           filters:
             branches:
-              only: main
+              ignore: /pull\/.*/ # Don't run on pull requests.
   push:
     jobs:
       - build: