diff --git a/.circleci/config.yml b/.circleci/config.yml
index 98b4c93..16fb810 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -5,7 +5,8 @@ executors:
     docker:
       - image: aeternity/builder
         user: builder
-    resource_class: medium+
+    environment:
+      ERLANG_ROCKSDB_BUILDOPTS: "-DWITH_BUNDLE_LZ4=ON -j2"
 
 jobs:
   build: