diff --git a/smoke/smoke.h b/smoke/smoke.h
index d0943af..cf48f76 100644
--- a/smoke/smoke.h
+++ b/smoke/smoke.h
@@ -7,6 +7,8 @@
  *   Copyright (C) 2002, Ashley Winters <qaqortog@nwlink.com>
  */
 
+#define ENABLE_TQSTYLECONTROLELEMENTDATA_SLOW_COPY 1
+
 class SmokeBinding;
 
 class Smoke {