diff --git a/pre_commit/commands/install_uninstall.py b/pre_commit/commands/install_uninstall.py
index 5ff6cba6..9220d57a 100644
--- a/pre_commit/commands/install_uninstall.py
+++ b/pre_commit/commands/install_uninstall.py
@@ -99,7 +99,7 @@ def _install_hook_script(
         # bash in "POSIXLY_CORRECT" mode which still supports the features we
         # use: subshells / arrays
         if sys.platform == 'win32':  # pragma: win32 cover
-            hook_file.write('#!/bin/sh\n')
+            before = before.replace("#!/usr/bin/env bash", "#!/bin/sh", 1)
 
         hook_file.write(before + TEMPLATE_START)
         hook_file.write(f'INSTALL_PYTHON={shlex.quote(sys.executable)}\n')