diff --git a/nixos/ninurta/configuration.nix b/nixos/ninurta/configuration.nix
index 8bf36de..003cdbc 100644
--- a/nixos/ninurta/configuration.nix
+++ b/nixos/ninurta/configuration.nix
@@ -225,10 +225,10 @@ in
       SUBVOLUME = "/home";
       TIMELINE_CREATE = true;
       TIMELINE_CLEANUP = true;
-      TIMELINE_LIMIT_HOURLY = 24;
-      TIMELINE_LIMIT_DAILY = 13;
-      TIMELINE_LIMIT_WEEKLY = 6;
-      TIMELINE_LIMIT_MONTHLY = 3;
+      TIMELINE_LIMIT_HOURLY = "24";
+      TIMELINE_LIMIT_DAILY = "13";
+      TIMELINE_LIMIT_WEEKLY = "6";
+      TIMELINE_LIMIT_MONTHLY = "3";
     };
     configs.var = {
       SUBVOLUME = "/var";