diff --git a/integration-tests/tools.nix b/integration-tests/tools.nix
index 5ed43ee..1c717f7 100644
--- a/integration-tests/tools.nix
+++ b/integration-tests/tools.nix
@@ -129,6 +129,9 @@ let
       extraDeployerConfig
     ];
 
+    # FIXME: Colmena flake support is broken with Nix 2.24
+    nix.package = pkgs.nixVersions.nix_2_18;
+
     nix.registry = lib.mkIf (pkgs ? _inputs) {
       nixpkgs.flake = pkgs._inputs.nixpkgs;
     };