diff --git a/dll/win32/mlang/CMakeLists.txt b/dll/win32/mlang/CMakeLists.txt
index bb6e7cebbb4..6462b0f2b0b 100644
--- a/dll/win32/mlang/CMakeLists.txt
+++ b/dll/win32/mlang/CMakeLists.txt
@@ -11,6 +11,7 @@ list(APPEND SOURCE
 
 add_library(mlang MODULE ${SOURCE} mlang.rc)
 set_module_type(mlang win32dll UNICODE)
+add_idl_reg_scripts(mlang registry mlang_classes.idl)
 target_link_libraries(mlang uuid wine wine_dll_canunload wine_dll_register oldnames)
 add_delay_importlibs(mlang oleaut32)
 add_importlibs(mlang gdi32 advapi32 msvcrt kernel32 kernel32_vista ntdll)