diff --git a/Makefile b/Makefile
index bb3c3a0..803a0c6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,16 +1,12 @@
 default: system image
 
-EXTRA_OPTIONS := \
-	--store /scratch/ \
-	--builders 'aarch64.nixos.community aarch64-linux - 64 64 big-parallel' \
-	--extra-substituters /?trusted=true \
-	--secret-key-files ''
+NIXPKGS := channel:nixos-20.09
 
 system: configuration.nix helios64.nix
 	nix-build '<nixpkgs/nixos>' \
 		--arg configuration ./configuration.nix \
 		-A config.system.build.toplevel \
-		-I nixpkgs=$(HOME)/nixpkgs/helios64 \
+		-I nixpkgs=$(NIXPKGS) \
 		-o $@ \
 		$(EXTRA_OPTIONS)
 
@@ -18,7 +14,7 @@ image: emmc-image.nix configuration.nix helios64.nix
 	nix-build '<nixpkgs/nixos>' \
 		--arg configuration ./emmc-image.nix \
 		-A config.system.build.sdImage \
-		-I nixpkgs=$(HOME)/nixpkgs/helios64 \
+		-I nixpkgs=$(NIXPKGS) \
 		-o $@ \
 		$(EXTRA_OPTIONS)