diff --git a/nixos/modules/system/boot/loader/systemd-boot/systemd-boot-builder.py b/nixos/modules/system/boot/loader/systemd-boot/systemd-boot-builder.py
index d5e00129a82..704c574b822 100644
--- a/nixos/modules/system/boot/loader/systemd-boot/systemd-boot-builder.py
+++ b/nixos/modules/system/boot/loader/systemd-boot/systemd-boot-builder.py
@@ -1,4 +1,4 @@
-#! @python3@/bin/python3
+#! @python3@/bin/python3 -B
 import argparse
 import shutil
 import os