diff --git a/overlays/site-musique.nix b/overlays/site-musique.nix
new file mode 100644
index 0000000..62f738b
--- /dev/null
+++ b/overlays/site-musique.nix
@@ -0,0 +1,5 @@
+self: super:
+
+{
+  site-musique = super.callPackage ../pkgs/site-musique { };
+}
diff --git a/pkgs/site-musique/default.nix b/pkgs/site-musique/default.nix
new file mode 100644
index 0000000..fc0f5d7
--- /dev/null
+++ b/pkgs/site-musique/default.nix
@@ -0,0 +1,24 @@
+{ lib, stdenv, fetchgit }:
+
+stdenv.mkDerivation rec {
+  name= "site-musique";
+
+  src = fetchgit {
+    url = "https://gitlab.com/nyanloutre/site-musique.git";
+    rev = "78e5d570534d528cdf19c44332cd2c929f6fa861";
+    sha256 = "0rv1il85gxvi4d6yal8ac7q9jjz0w0ghmklbwzpd3p04v34y1rpd";
+  };
+
+  installPhase = ''
+    mkdir -p $out/
+    cp -R . $out/
+  '';
+
+  meta = {
+    description = "Site internet de l'association Musique Fraternité de Meyenheim";
+    homepage = https://musique-meyenheim.fr/;
+    maintainers = with stdenv.lib.maintainers; [ nyanloutre ];
+    license = stdenv.lib.licenses.cc-by-nc-sa-40;
+    platforms = stdenv.lib.platforms.all;
+  };
+}
diff --git a/services/pr-autobot.py b/services/pr-autobot.py
index 0d41877..350ad13 100755
--- a/services/pr-autobot.py
+++ b/services/pr-autobot.py
@@ -59,7 +59,7 @@ if latest_commit != previous_commit:
 
     pr = repo.create_pull(title=branch, body=pr_message, base='nixos-18.09', head=branch)
 
-    print("Pull request numéro " + str(pr.number) + " créée")
+    print("Pull request numéro " + str(pr.numero) + " créée")
     print("URL : " + pr.html_url)
 
     while pr.mergeable == None:
diff --git a/services/site-musique.nix b/services/site-musique.nix
index ef1fbd2..78f6101 100644
--- a/services/site-musique.nix
+++ b/services/site-musique.nix
@@ -24,6 +24,10 @@ in
 
   config = mkIf cfg.enable {
 
+    nixpkgs.overlays = [
+      (import ../overlays/site-musique.nix)
+    ];
+
     services.haproxy-acme.services = {
       ${cfg.domaine} = { ip = "127.0.0.1"; port = cfg.port; auth = false; };
     };
@@ -32,7 +36,7 @@ in
       "musique" = {
         listen = [ { addr = "127.0.0.1"; port = cfg.port; } ];
         locations."/" = {
-          root = "/run/site-musique/result";
+          root = pkgs.site-musique;
           index = "index.php";
           extraConfig = ''
             location ~* \.php$ {
@@ -63,39 +67,5 @@ in
       catch_workers_output = yes
     '';
 
-    systemd.services.build-site-musique = {
-      description = "Compilation du site de la musique";
-      requires = ["network-online.target"];
-      path = with pkgs;[ git nix ];
-      environment = { HOME = "/var/lib/site-musique"; NIX_PATH = "nixpkgs=/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs"; };
-
-      serviceConfig = {
-        DynamicUser = true;
-        RuntimeDirectory = "site-musique";
-        RuntimeDirectoryPreserve = "yes";
-        CacheDirectory = "site-musique";
-        Type = "oneshot";
-        ExecStart = "${pkgs.writeShellScriptBin "build.sh" ''
-          set -x
-          set -e
-          GIT_CLONE_DIR=/var/cache/site-musique
-
-          if [ ! -d $GIT_CLONE_DIR/.git ]; then
-            git clone --depth 1 https://gitlab.com/nyanloutre/site-musique.git $GIT_CLONE_DIR
-          else
-            git -C $GIT_CLONE_DIR pull
-          fi
-
-          NIXPKGS_ALLOW_UNFREE=1 nix-build -o /run/site-musique/result $GIT_CLONE_DIR
-        ''}/bin/build.sh";
-      };
-    };
-
-    systemd.timers.build-site-musique = {
-      description = "Timer de compilation du site de la musique";
-      requires = ["network-online.target"];
-      wantedBy = ["multi-user.target"];
-      timerConfig = { OnCalendar = "*:0/5"; Unit = "build-site-musique.service"; };
-    };
   };
 }