diff --git a/Lts/CMakeLists.txt b/Lts/CMakeLists.txt
index 4ce0684b4..75ffd52d5 100644
--- a/Lts/CMakeLists.txt
+++ b/Lts/CMakeLists.txt
@@ -40,4 +40,7 @@ IF (BUILD_DOCS)
   ADD_SUBDIRECTORY(Documentation)
 ENDIF()
 
+# Ensure codegen macros are available before calling CODEGEN_* helpers
+INCLUDE(MacroCodeGenIdl)
+
 CODEGEN_WRITE_SERVICEFILE_INFO()