diff --git a/nix/sources.json b/nix/sources.json
index 99fdd02..ba04d01 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -35,6 +35,12 @@
         "url": "https://github.com/input-output-hk/iohk-nix/archive/df1da282f996ec46b33379407df99613a1fbafdd.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
+    "mcwhirter-io": {
+        "sha256": "1izx568c152lcgf4ia2zcx83mvcbdr91k9nxqvsvk7y1fs0xk1cv",
+        "type": "tarball",
+        "url": "https://source.mcwhirter.io/craige/mcwhirter.io/archive/consensus.tar.gz",
+        "url_template": "https://source.mcwhirter.io/craige/mcwhirter.io/archive/consensus.tar.gz"
+    },
     "niv": {
         "branch": "master",
         "description": "Easy dependency management for Nix projects",
diff --git a/profiles/mcwhirter.io.nix b/profiles/mcwhirter.io.nix
index 5a28945..8221b4c 100644
--- a/profiles/mcwhirter.io.nix
+++ b/profiles/mcwhirter.io.nix
@@ -3,12 +3,8 @@
 { config, pkgs, ...}:
 
 let
-  mcwhirter-io = import (pkgs.fetchgit {
-    name       = "mcwhirter-io-src";
-    url        = "https://source.mcwhirter.io/craige/mcwhirter.io.git";
-    branchName = "consensus";
-    sha256     = "sha256-m4XZgXbBn7n1xt2mGVJui+06UGdfqEjcY1SUwJAp/cc=";
-  }) { nixpkgs = pkgs; };
+  sources = import ../nix/sources.nix;
+  mcwhirter-io = import sources.mcwhirter-io {};
   webdomain = "mcwhirter.io";
 
 in {