diff --git a/harbour/ChangeLog b/harbour/ChangeLog
index 3a9fa203b0..bbc04f1f38 100644
--- a/harbour/ChangeLog
+++ b/harbour/ChangeLog
@@ -16,6 +16,10 @@
    The license applies to all entries newer than 2009-04-28.
 */
 
+2012-05-08 06:50 UTC-0800 Pritpal Bedi (bedipritpal@hotmail.com)
+  * contrib/hbqt/qtgui/qth/QWheelEvent.qth
+    ! Fixed: ISNUM() => HB_ISNUM.
+
 2012-05-08 12:28 UTC+0200 Przemyslaw Czerpak (druzus/at/poczta.onet.pl)
   * harbour/src/common/expropt2.c
     * small code simplification
diff --git a/harbour/contrib/hbqt/qtgui/qth/QWheelEvent.qth b/harbour/contrib/hbqt/qtgui/qth/QWheelEvent.qth
index 7053079034..405b22dd57 100644
--- a/harbour/contrib/hbqt/qtgui/qth/QWheelEvent.qth
+++ b/harbour/contrib/hbqt/qtgui/qth/QWheelEvent.qth
@@ -33,11 +33,11 @@ HB_FUNC( QT_QWHEELEVENT )
    {
       __HB_RETPTRGC__( new QWheelEvent( *hbqt_par_QWheelEvent( 1 ) ) );
    }
-   else if( hb_pcount() >= 4 && hbqt_par_isDerivedFrom( 1, "QPOINT" ) && ISNUM( 2 ) && ISNUM( 3 ) && HB_ISNUM( 4 ) )
+   else if( hb_pcount() >= 4 && hbqt_par_isDerivedFrom( 1, "QPOINT" ) && HB_ISNUM( 2 ) && HB_ISNUM( 3 ) && HB_ISNUM( 4 ) )
    {
       __HB_RETPTRGC__( new QWheelEvent( *hbqt_par_QPoint( 1 ), hb_parni( 2 ), ( Qt::MouseButtons ) hb_parni( 3 ), ( Qt::KeyboardModifiers ) hb_parni( 4 ), ( Qt::Orientation ) ( HB_ISNUM( 5 ) ? hb_parni( 5 ) : Qt::Vertical ) ) );  
    }
-   else if( hb_pcount() >= 5 && hbqt_par_isDerivedFrom( 1, "QPOINT" ) && hbqt_par_isDerivedFrom( 2, "QPOINT" ) && ISNUM( 3 ) && ISNUM( 4 ) && HB_ISNUM( 5 ) )
+   else if( hb_pcount() >= 5 && hbqt_par_isDerivedFrom( 1, "QPOINT" ) && hbqt_par_isDerivedFrom( 2, "QPOINT" ) && HB_ISNUM( 3 ) && HB_ISNUM( 4 ) && HB_ISNUM( 5 ) )
    {
       __HB_RETPTRGC__( new QWheelEvent( *hbqt_par_QPoint( 1 ), *hbqt_par_QPoint( 2 ), hb_parni( 3 ), ( Qt::MouseButtons ) hb_parni( 4 ), ( Qt::KeyboardModifiers ) hb_parni( 5 ), ( Qt::Orientation ) ( HB_ISNUM( 6 ) ? hb_parni( 6 ) : Qt::Vertical ) ) );  
    }