diff --git a/build.py b/build.py
index c49ada6..2a02c1c 100644
--- a/build.py
+++ b/build.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 import subprocess
 import os
 import shutil
@@ -56,7 +58,7 @@ if __name__ == "__main__":
     # TODO?: install node deps automatically
 
     if not args.no_rebuild:
-        build = subprocess.call(["bun", "run", "build"], cwd="./gui", shell=True)
+        build = subprocess.call(["bun", "run", "build"], cwd="./gui", shell=(os.name == "nt"))
         if build != 0:
             print("[ERROR] Next.js gui has failed to build")
             raise
@@ -110,7 +112,7 @@ if __name__ == "__main__":
                 "templates:templates",
             ],
             cwd="./dist",
-            shell=True,
+            shell=(os.name == "nt"),
         )
         if build != 0:
             print("[ERROR] pyinstaller has failed to build an app")
@@ -140,7 +142,7 @@ if __name__ == "__main__":
                 "mc_version.json:.",
             ],
             cwd="./dist",
-            shell=True,
+            shell=(os.name == "nt"),
         )
         if build != 0:
             print("[ERROR] pyinstaller has failed to build an app")
diff --git a/dev.py b/dev.py
index 6289f5b..38f4352 100644
--- a/dev.py
+++ b/dev.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 import subprocess
 import time
 import os
@@ -13,10 +15,10 @@ if __name__ == "__main__":
     # TODO?: install node deps automatically
 
     gui_proc = subprocess.Popen(
-        ["bun", "run", "dev"], cwd="./gui", env=environment, shell=True
+        ["bun", "run", "dev"], cwd="./gui", env=environment, shell=(os.name == "nt")
     )
     app_proc = subprocess.Popen(
-        ["python", "main.py"], cwd="./src", env=environment, shell=True
+        ["python", "main.py"], cwd="./src", env=environment, shell=(os.name == "nt")
     )
 
     try:
diff --git a/src/cli.py b/src/cli.py
index 31b1e71..f3c0884 100644
--- a/src/cli.py
+++ b/src/cli.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 import os
 from sys import exit
 
diff --git a/src/main.py b/src/main.py
index 80b59c8..2a76764 100644
--- a/src/main.py
+++ b/src/main.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 from flask import Flask
 from flask import render_template, send_file, abort
 from flaskwebgui import FlaskUI  # import FlaskUI