diff --git a/system/modules/common.nix b/system/modules/common.nix
index 3bac19bec..230652c3d 100644
--- a/system/modules/common.nix
+++ b/system/modules/common.nix
@@ -115,9 +115,11 @@
 
     distributedBuilds = true;
 
-    # gc = {
-    #   automatic = true;
-    #   dates = "
+    gc = {
+      automatic = true;
+      dates = "weekly";
+      options = "--delete-older-than 30d";
+    };
   };
 
   urbos.enable = true;