diff --git a/Telegram/build/prepare/prepare.py b/Telegram/build/prepare/prepare.py
index ff66d9d53c..b4f7b3e16e 100644
--- a/Telegram/build/prepare/prepare.py
+++ b/Telegram/build/prepare/prepare.py
@@ -447,7 +447,7 @@ if customRunCommand:
             with tempfile.NamedTemporaryFile(mode='w', delete=False) as tmp_zshrc:
                 tmp_zshrc.write(f'export PS1="{prompt}"\n')
                 tmp_zshrc_path = tmp_zshrc.name
-            subprocess.run(['zsh', '--rcs', tmp_zshrc_path], env=modifiedEnv)
+            subprocess.run(['zsh', '--rcs', tmp_zshrc_path], shell=True, env=modifiedEnv)
             os.remove(tmp_zshrc_path)
     elif not run(' '.join(runCommand) + '\n'):
         print('FAILED :(')