diff --git a/src/gui/text/qtextdocument_p.cpp b/src/gui/text/qtextdocument_p.cpp
index 2869f75355..d4ea9827ce 100644
--- a/src/gui/text/qtextdocument_p.cpp
+++ b/src/gui/text/qtextdocument_p.cpp
@@ -63,7 +63,7 @@ QT_BEGIN_NAMESPACE
 // The VxWorks DIAB compiler crashes when initializing the anonymouse union with { a7 }
 #if !defined(Q_CC_DIAB)
 #  define QT_INIT_TEXTUNDOCOMMAND(c, a1, a2, a3, a4, a5, a6, a7, a8) \
-          QTextUndoCommand c = { a1, a2, 0, 0, quint8(a3), a4, a5, a6, { a7 }, a8 }
+          QTextUndoCommand c = { a1, a2, 0, 0, quint8(a3), a4, quint32(a5), quint32(a6), { int(a7) }, quint32(a8) }
 #else
 #  define QT_INIT_TEXTUNDOCOMMAND(c, a1, a2, a3, a4, a5, a6, a7, a8) \
           QTextUndoCommand c = { a1, a2, 0, 0, a3, a4, a5, a6 }; c.blockFormat = a7; c.revision = a8