diff --git a/configs/default.nix b/configs/default.nix
index 9b01975..aea2be4 100644
--- a/configs/default.nix
+++ b/configs/default.nix
@@ -179,12 +179,15 @@ in
 
           [ $# -eq 1 ] || echo >&2 "Usage: niveum-deploy SYSTEM"
 
-          eval $(nix-build --no-out-link "$NIVEUM_DIR/deploy.nix" -A "$1")
+          eval $(${pkgs.nix}/bin/nix-build --no-out-link "$NIVEUM_DIR/deploy.nix" -A "$1")
         '')
         (pkgs.writers.writeDashBin "niveum-update" ''
           NIVEUM_DIR=/home/kfm/prog/git/niveum
 
-          nix-prefetch-git --url https://github.com/NixOS/nixpkgs-channels --rev refs/heads/nixos-${config.system.stateVersion} > "$NIVEUM_DIR/nixpkgs.json"
+          ${pkgs.nix-prefetch-git}/bin/nix-prefetch-git \
+            --url https://github.com/NixOS/nixpkgs-channels \
+            --rev refs/heads/nixos-${config.system.stateVersion}
+            > "$NIVEUM_DIR/nixpkgs.json"
         '')
       ];
     }