diff --git a/machines/nucturne/default.nix b/machines/nucturne/default.nix
index 2654f4f..4794dda 100644
--- a/machines/nucturne/default.nix
+++ b/machines/nucturne/default.nix
@@ -24,7 +24,7 @@
     };
 
     # enable deamon to generate nix-index-db
-    nix-index-db-update.enable = false;
+    nix-index-db-update.enable = true;
 
     # add TUD vpn
     openvpn.enable = true;
diff --git a/modules/nix-index-db.nix b/modules/nix-index-db.nix
index 4fb336b..6a589e7 100644
--- a/modules/nix-index-db.nix
+++ b/modules/nix-index-db.nix
@@ -23,13 +23,13 @@ with lib; {
           serviceConfig = {
             CPUSchedulingPolicy = "idle";
             IOSchedulingClass = "idle";
-            ExecStartPre = ''
-              +${pkgs.coreutils}/bin/mkdir -p /var/db/nix-index/
-              +${pkgs.coreutils}/bin/chown nobody:nobody /var/db/nix-index/
-            '';
+            ExecStartPre = [
+              "+${pkgs.coreutils}/bin/mkdir -p /var/db/nix-index/"
+              "+${pkgs.coreutils}/bin/chown nobody:nobody /var/db/nix-index/"
+            ];
             ExecStart = toString nix-index-db-update;
-            User = nobody;
-            Group = nobody;
+            User = "nobody";
+            Group = "nobody";
           };
         };