diff --git a/sip/qt/qstyle.sip b/sip/qt/qstyle.sip
index f902ea1..37ef003 100644
--- a/sip/qt/qstyle.sip
+++ b/sip/qt/qstyle.sip
@@ -74,6 +74,7 @@ This takes only the <Literal>t</Literal> parameter and returns a tuple of the
 class TQStyleOption
 {
 %TypeHeaderCode
+#define ENABLE_TQSTYLECONTROLELEMENTDATA_SLOW_COPY 1
 #include <tqstyle.h>
 %End
 
@@ -170,6 +171,7 @@ class TQStyleControlElementData;
 class TQStyleWidgetActionRequestData
 {
 %TypeHeaderCode
+#define ENABLE_TQSTYLECONTROLELEMENTDATA_SLOW_COPY 1
 #include <tqstyle.h>
 %End
 
@@ -189,6 +191,7 @@ typedef TQStyleWidgetActionRequestData TQStyleApplicationActionRequestData;
 class TQStyle : TQObject
 {
 %TypeHeaderCode
+#define ENABLE_TQSTYLECONTROLELEMENTDATA_SLOW_COPY 1
 #include <tqstyle.h>
 %End