diff --git a/include/mlang.idl b/include/mlang.idl
index 96e96fa..c76826a 100644
--- a/include/mlang.idl
+++ b/include/mlang.idl
@@ -16,7 +16,9 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
+#ifndef DO_NO_IMPORTS
 import "unknwn.idl";
+#endif
 
 interface IStream;