diff --git a/hosts/thrall/default.nix b/hosts/thrall/default.nix
index db917a5..1151964 100644
--- a/hosts/thrall/default.nix
+++ b/hosts/thrall/default.nix
@@ -11,14 +11,9 @@ in {
     ./hardware-configuration.nix
     ../../modules/upgrade-pg-cluster.nix
     ../../modules/nix-config.nix
+    ../../modules/iohk.nix
   ];
 
-  # Binary Cache for Haskell.nix
-  nix.settings.trusted-public-keys =
-    [ "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=" ];
-
-  #nix.binaryCaches = [ "https://hydra.iohk.io" ];
-
   # Use the GRUB 2 boot loader.
   boot.loader.grub.enable = true;
   # boot.loader.grub.efiSupport = true;
diff --git a/modules/iohk.nix b/modules/iohk.nix
new file mode 100644
index 0000000..b4215c9
--- /dev/null
+++ b/modules/iohk.nix
@@ -0,0 +1,9 @@
+{ config, lib, pkgs, ... }:
+
+{
+  # Binary Cache for Haskell.nix
+  nix.settings.trusted-public-keys =
+    [ "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=" ];
+
+  nix.settings.substituters = lib.mkAfter [ "https://hydra.iohk.io" ];
+}