diff --git a/.github/workflows/push.yaml b/.github/workflows/push.yaml
index adbff3b3f..30b7a4457 100644
--- a/.github/workflows/push.yaml
+++ b/.github/workflows/push.yaml
@@ -82,6 +82,8 @@ jobs:
       - uses: cachix/install-nix-action@v22
         with:
           nix_path: nixpkgs=channel:nixos-unstable
+          extra_nix_config: |
+            auto-optimise-store = true
       - uses: cachix/cachix-action@v12
         with:
           name: coliasgroup
@@ -123,6 +125,8 @@ jobs:
       - uses: cachix/install-nix-action@v22
         with:
           nix_path: nixpkgs=channel:nixos-unstable
+          extra_nix_config: |
+            auto-optimise-store = true
       - uses: cachix/cachix-action@v12
         with:
           name: coliasgroup