diff --git a/Makefile b/Makefile
index 6e2f698..a6b3cfd 100644
--- a/Makefile
+++ b/Makefile
@@ -32,7 +32,7 @@ list-installed-packages:
 	nixos-option environment.systemPackages | head -2 | tail -1 | sed -e 's/ /\n/g' | cut -d- -f2- | sort | uniq| sed -e 's/"$$//'
 
 optimise:
-	$(TIME) nix optimise-store
+	$(TIME) nix store optimise
 
 rebuild-build:
 	nix-channel --add https://nixos.org/channels/nixos-unstable nixos