diff --git a/harbour/ChangeLog b/harbour/ChangeLog
index 21dc9ebb1e..22f6f64a23 100644
--- a/harbour/ChangeLog
+++ b/harbour/ChangeLog
@@ -8,6 +8,12 @@
    2002-12-01 23:12 UTC+0100 Foo Bar <foo.bar@foobar.org>
 */
 
+2004-03-19 11:40 UTC+0100 Ryszard Glab <rglab@imid.med.pl>
+   * utils/hbmake/hbmake.prg
+      *fixed #define datediff(<x>,<y>) into datediff(x,y)
+      (Clipper compatibility)    (thanks to Jacek Kubica)
+
+
 2004-03-19 08:20 UTC+0100 Ryszard Glab <rglab@imid.med.pl>
    * source/debug/debugger.prg
       * fixed refreshing of watchpoints
diff --git a/harbour/utils/hbmake/hbmake.prg b/harbour/utils/hbmake/hbmake.prg
index 17c663acca..2e72cb1efe 100644
--- a/harbour/utils/hbmake/hbmake.prg
+++ b/harbour/utils/hbmake/hbmake.prg
@@ -65,7 +65,7 @@
 #xtranslate timetosec(<x>) => ((val(substr(<x>,1,2))*3600)+(val(substr(<x>,4,2))*60)+(val(substr(<x>,7,2))))
 
 #ifdef __HARBOUR__
-#define datediff(<x>,<y>) (<x>-<y>)
+#define datediff(x,y) (x-y)
 #else
 #translate datediff(<x>,<y>) => (<x>-<y>)
 #endif