diff --git a/.circleci/config.yml b/.circleci/config.yml
index 7d9fa4e..f097a23 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -40,7 +40,7 @@ jobs:
       - run:
           name: "GHC 865"
           command: |
-            nix-build -A free-category -o result-fc --argstr compiler ghc865
+            nix-build -A free-category -o result-fc --arg benchmarks true --argstr compiler ghc865
             nix-build -A examples -o result-ex --argstr compiler ghc865
       - cachix-push:
           o: result-fc
@@ -53,7 +53,7 @@ jobs:
       - run:
           name: "GHC 844"
           command: |
-            nix-build -A free-category -o result-fc --argstr compiler ghc844
+            nix-build -A free-category -o result-fc --arg benchmarks true --argstr compiler ghc844
             nix-build -A examples -o result-ex --argstr compiler ghc844
       - cachix-push:
           o: result-fc
@@ -66,7 +66,7 @@ jobs:
       - run:
           name: "GHC 822"
           command: |
-            nix-build -A free-category -o result-fc --argstr compiler ghc822
+            nix-build -A free-category -o result-fc --arg benchmarks true --argstr compiler ghc822
             nix-build -A examples -o result-ex --argstr compiler ghc822
       - cachix-push:
           o: result-fc
@@ -80,7 +80,7 @@ jobs:
       - run:
           name: "GHC 802"
           command: |
-            nix-build -A free-category -o result-fc --argstr compiler ghc802
+            nix-build -A free-category -o result-fc --arg benchmarks true --argstr compiler ghc802
             nix-build -A examples -o result-ex --argstr compiler ghc802
       - cachix-push:
           o: result-fc
diff --git a/default.nix b/default.nix
index ce3f9b4..e7b560c 100644
--- a/default.nix
+++ b/default.nix
@@ -30,6 +30,7 @@ let
     in 
        nixpkgs.lib.hasPrefix "src" relPath
     || nixpkgs.lib.hasPrefix "test" relPath
+    || nixpkgs.lib.hasPrefix "bench" relPath
     || nixpkgs.lib.any
         (a: a == relPath)
         [ "Setup.hs" "cabal.project" "ChangeLog.md" "free-category.cabal" "LICENSE"];