diff --git a/.circleci/config.yml b/.circleci/config.yml
index 022649f43..1fb32ef6d 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -28,7 +28,7 @@ commands:
       - run:  make build/.params-1024
       - save_cache:
           name: Save parameters cache
-          key: 'v1-lotus-params-{{ "checksum build/proof-params/parameters.json" }}'
+          key: 'v1-lotus-params-{{ checksum "build/proof-params/parameters.json" }}'
           paths:
             - /var/tmp/filecoin-proof-parameters/
             - build/.params-1024