diff --git a/.build.yml b/.build.yml
index 4e56d38..1ab5659 100644
--- a/.build.yml
+++ b/.build.yml
@@ -1,4 +1,6 @@
 image: debian/stable
+packages:
+- xxd
 oauth: pages.sr.ht/PAGES:RW
 environment:
     SITE: rabbits.srht.site/nasu
@@ -7,11 +9,10 @@ sources:
     - https://git.sr.ht/~rabbits/nasu
 tasks:
     - prepare: |
-        cd uxn11
-        cc src/uxnasm.c -o ../uxnasm
+        xxd -r -p uxn11/etc/utils/drifloon.rom.txt drifloon.rom
+        cc -DNDEBUG -O2 -g0 -s uxn11/src/uxnmin.c -o uxnmin
     - assemble: |
-        cd nasu
-        ../uxnasm src/nasu.tal ../nasu.rom
+        cat nasu/src/nasu.tal nasu/src/manifest.tal nasu/src/assets.tal | uxnmin drifloon.rom > nasu.rom
     - upload: |
         tar -czf out.tar.gz nasu.rom
         acurl() {