diff --git python/private/runtime_env_toolchain.bzl python/private/runtime_env_toolchain.bzl
--- python/private/runtime_env_toolchain.bzl
+++ python/private/runtime_env_toolchain.bzl
@@ -42,7 +42,7 @@
         name = "_runtime_env_py3_runtime",
         interpreter = "//python/private:runtime_env_toolchain_interpreter.sh",
         python_version = "PY3",
-        stub_shebang = "#!/usr/bin/env python3",
+        stub_shebang = "#!@usrBinEnv@ python3",
         visibility = ["//visibility:private"],
         tags = ["manual"],
     )