diff --git a/marp/flake.nix b/marp/flake.nix
index 18d9038..2e573d0 100644
--- a/marp/flake.nix
+++ b/marp/flake.nix
@@ -17,7 +17,17 @@
         { pkgs, ... }:
         {
           devshells.default = {
-            packages = [ pkgs.marp-cli ];
+            packages = [
+              (pkgs.writeShellApplication {
+                name = "build";
+
+                runtimeInputs = [ pkgs.marp-cli ];
+
+                text = ''
+                  marp slides.md --preview --watch
+                '';
+              })
+            ];
           };
         };
     };
diff --git a/marp/run b/marp/run
deleted file mode 100755
index 02d31cf..0000000
--- a/marp/run
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/usr/bin/env sh
-
-marp slides.md --preview --watch