diff --git a/.circleci/config.yml b/.circleci/config.yml
index 7d6818e..29d5893 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -13,6 +13,8 @@ jobs:
       - run:
           name: Compile
           command: nix-shell --run 'make sdist test -j2'
+          environment:
+            CABAL_BUILD_FLAGS: --jobs=2
       - save_cache:
           key: v2-nix-{{ checksum "package.yaml" }}
           name: Caching nix
diff --git a/Makefile b/Makefile
index 47405ad..3912826 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
 CABAL ?= cabal
 CABAL_FLAGS ?=
+CABAL_BUILD_FLAGS ?=
 DIST ?= dist
 GHCID ?= ghcid
 GHCID_FLAGS ?= --ghc-options=-fno-code
@@ -22,7 +23,7 @@ $(CONFIGURE): $(CABAL_FILE)
 
 .PHONY: build
 build $(DOC_TEST): $(CONFIGURE) default.nix
-	$(CABAL) $(CABAL_FLAGS) build
+	$(CABAL) $(CABAL_FLAGS) build $(CABAL_BUILD_FLAGS)
 
 .PHONY: check
 check: $(CABAL_FILE)