--- a/python/private/py_executable_bazel.bzl
+++ b/python/private/py_executable_bazel.bzl
@@ -538,7 +538,7 @@
             is_for_zip = True,
         )
     else:
-        ctx.actions.write(prelude, "#!/usr/bin/env python3\n")
+        ctx.actions.write(prelude, "#!%%PYTHON_CMD%%\n")

     ctx.actions.run_shell(
         command = "cat {prelude} {zip} > {output}".format(