diff --git a/src/frontends/qt2/ChangeLog b/src/frontends/qt2/ChangeLog
index 37c79026e3..2751ddb8db 100644
--- a/src/frontends/qt2/ChangeLog
+++ b/src/frontends/qt2/ChangeLog
@@ -1,3 +1,7 @@
+2003-12-10  Angus Leeming  <leeming@lyx.org>
+
+	* lengthvalidator.[Ch]: make <qwidget.h> visible to the class.
+
 2003-12-09  Jean-Marc Lasgouttes  <lasgouttes@lyx.org>
 
 	* lengthvalidator.[Ch] (LengthValidator): change the constructor to
diff --git a/src/frontends/qt2/lengthvalidator.C b/src/frontends/qt2/lengthvalidator.C
index 24036fdc94..e08291b397 100644
--- a/src/frontends/qt2/lengthvalidator.C
+++ b/src/frontends/qt2/lengthvalidator.C
@@ -17,6 +17,8 @@
 
 #include "qt_helpers.h"
 
+#include <qwidget.h>
+
 
 using lyx::support::isStrDbl;
 using std::string;
diff --git a/src/frontends/qt2/lengthvalidator.h b/src/frontends/qt2/lengthvalidator.h
index dc5a9af68c..48bf2ff591 100644
--- a/src/frontends/qt2/lengthvalidator.h
+++ b/src/frontends/qt2/lengthvalidator.h
@@ -15,6 +15,8 @@
 #include "lyxlength.h"
 #include <qvalidator.h>
 
+class QWidget;
+
 
 class Q_EXPORT LengthValidator : public QValidator
 {