diff --git a/morph/lib/issuer-aws.nix b/morph/lib/issuer-aws.nix
index 2db5a7aa0e589f31e9c78cffc57d6e356fec737c..bf7de56cfb570857da32c34ebfcc9b21c91e702e 100644
--- a/morph/lib/issuer-aws.nix
+++ b/morph/lib/issuer-aws.nix
@@ -17,4 +17,11 @@
   # morph-supplied name.  See also
   # <https://github.com/DBCDK/morph/issues/146>.
   networking.hostName = name;
+
+  # Clean up packages after a while
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 30d";
+  };
 }