diff --git a/default.nix b/default.nix
index c70878de8..9bc5b1c42 100644
--- a/default.nix
+++ b/default.nix
@@ -1,4 +1,8 @@
-with import <nixpkgs> {};
+with import (builtins.fetchGit {
+  url = https://github.com/NixOS/nixpkgs-channels;
+  ref = "nixos-18.09-small";
+  rev = "95fed28ac372c61eb83c87ad97c24b0f957827bf";
+}) {};
 
 stdenv.mkDerivation {
   name = "postgrest-docs";