diff --git a/tup.config b/build-x86_64/tup.config
similarity index 94%
rename from tup.config
rename to build-x86_64/tup.config
index dfa785d..6dcc524 100644
--- a/tup.config
+++ b/build-x86_64/tup.config
@@ -1,3 +1,5 @@
+CONFIG_TUP_ARCH=@x86_64@
+
 CONFIG_SCULPT_VERSION=19.02
 CONFIG_SDK_USER=ehmry
 CONFIG_SDK_VERSION=19.02