diff --git a/modules/system/checks.nix b/modules/system/checks.nix
index 57ddfd2..a5fd44a 100644
--- a/modules/system/checks.nix
+++ b/modules/system/checks.nix
@@ -211,8 +211,8 @@ let
     if ! test -e "$darwinPath"; then
         echo "error: Changed <darwin> but target does not exist, aborting activation" >&2
         echo "Add the darwin repo as a channel or set nix.nixPath:" >&2
-        echo "$ nix-channel --add https://github.com/LnL7/nix-darwin/archive/master.tar.gz darwin" >&2
-        echo "$ nix-channel --update" >&2
+        echo "$ sudo nix-channel --add https://github.com/LnL7/nix-darwin/archive/master.tar.gz darwin" >&2
+        echo "$ sudo nix-channel --update" >&2
         echo >&2
         echo "or set" >&2
         echo >&2
@@ -225,8 +225,8 @@ let
     if ! test -e "$nixpkgsPath"; then
         echo "error: Changed <nixpkgs> but target does not exist, aborting activation" >&2
         echo "Add a nixpkgs channel or set nix.nixPath:" >&2
-        echo "$ nix-channel --add http://nixos.org/channels/nixpkgs-unstable nixpkgs" >&2
-        echo "$ nix-channel --update" >&2
+        echo "$ sudo nix-channel --add http://nixos.org/channels/nixpkgs-unstable nixpkgs" >&2
+        echo "$ sudo nix-channel --update" >&2
         echo >&2
         echo "or set" >&2
         echo >&2