diff --git a/Makefile b/Makefile
index cee3b53..6548329 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,8 @@ history:
 
 gc:
 	# remove all generations older than 7 days
-	sudo nix profile wipe-history --profile /nix/var/nix/profiles/system  --older-than 7d --extra-experimental-features nix-command
+	sudo nix profile wipe-history --profile /nix/var/nix/profiles/system  --older-than 3d --extra-experimental-features nix-command
 
 	# garbage collect all unused nix store entries
 	sudo nix store gc --debug --extra-experimental-features nix-command
+	nix-collect-garbage -d