diff --git a/core/SConscript.prodtest b/core/SConscript.prodtest
index e1b7c2f79..22a6626d0 100644
--- a/core/SConscript.prodtest
+++ b/core/SConscript.prodtest
@@ -196,9 +196,9 @@ obj_program.extend(env.Object(source=SOURCE_HAL))
 MODEL_IDENTIFIER = tools.get_model_identifier(TREZOR_MODEL)
 
 
-if (vh := ARGUMENTS.get("VENDOR_HEADER", None)) is not None:
+if (vh := ARGUMENTS.get("VENDOR_HEADER", None)):
     VENDORHEADER = vh
-elif (vh := os.environ.get("VENDOR_HEADER", None)) is not None:
+elif (vh := os.environ.get("VENDOR_HEADER", None)):
     # TODO looking at envvars in a build script is not very nice. But justifiable in case
     # of vendor header which does not affect reproducibility of the build. Nonetheless,
     # we should figure out a cleaner way to pass in this argument, without having to teach