diff --git a/configuration.nix b/configuration.nix
index c202c1a..0f7677a 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -35,7 +35,7 @@
     };
     gc = {
       automatic = true;
-      options = "--delete-older-then 14d";
+      options = "--delete-older-than 14d";
     };
   };