diff --git a/modules/default.nix b/modules/default.nix
index aa3fd56..2661111 100644
--- a/modules/default.nix
+++ b/modules/default.nix
@@ -76,6 +76,11 @@
 
       # On-the-fly optimisation of nix store
       autoOptimiseStore = true;
+      # Keep output of derivations with gc root
+      extraOptions = ''
+        keep-outputs = true
+        keep-derivations = true
+      '';
 
       # Make nix build in background less noticeable
       daemonIONiceLevel = 5; # 0-7