diff --git a/.buildbot.sh b/.buildbot.sh
index 233a90e..dc54277 100644
--- a/.buildbot.sh
+++ b/.buildbot.sh
@@ -49,11 +49,11 @@ YKB_YKLLVM_BUILD_ARGS="define:CMAKE_C_COMPILER=/usr/bin/clang,define:CMAKE_CXX_C
 export PATH=`pwd`/bin:${PATH}
 cd ..
 
-YKD_NEW_CODEGEN=1 YK_BUILD_TYPE=debug make -j `nproc`
+YK_BUILD_TYPE=debug make -j `nproc`
 
 # Run the bundled test suite.
 cd tests
-YKD_NEW_CODEGEN=1 YKD_SERIALISE_COMPILATION=1 ../src/lua -e"_U=true" all.lua
+YKD_SERIALISE_COMPILATION=1 ../src/lua -e"_U=true" all.lua
 cd ..
 
 # Run third-party test suites.