diff --git a/apps/twnlua/CMakeLists.txt b/apps/twnlua/CMakeLists.txt
index 6dcca8a..4f17bd0 100644
--- a/apps/twnlua/CMakeLists.txt
+++ b/apps/twnlua/CMakeLists.txt
@@ -20,14 +20,14 @@ add_custom_command(
 )
 
 add_custom_command(
-   OUTPUT ${CMAKE_SOURCE_DIR}/data/scripts/twnapi.lua
-   COMMAND ${PYTHON3} ${CMAKE_CURRENT_SOURCE_DIR}/docgen.py $ENV{TWNROOT}/share/twn_api.json > ${CMAKE_SOURCE_DIR}/data/scripts/twnapi.lua
+   OUTPUT ${TWN_OUT_DIR}/data/scripts/twnapi.lua
+   COMMAND ${PYTHON3} ${CMAKE_CURRENT_SOURCE_DIR}/docgen.py $ENV{TWNROOT}/share/twn_api.json > ${TWN_OUT_DIR}/data/scripts/twnapi.lua
    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/docgen.py $ENV{TWNROOT}/share/twn_api.json
 )
 
 add_custom_target(
     twnlua_docgen ALL
-    DEPENDS ${CMAKE_SOURCE_DIR}/data/scripts/twnapi.lua
+    DEPENDS ${TWN_OUT_DIR}/data/scripts/twnapi.lua
 )
 
 add_compile_definitions(LUA_32BITS)