diff --git a/harbour/ChangeLog b/harbour/ChangeLog
index 122748f336..98481455dc 100644
--- a/harbour/ChangeLog
+++ b/harbour/ChangeLog
@@ -16,6 +16,16 @@
    The license applies to all entries newer than 2009-04-28.
 */
 
+2011-01-30 15:36 UTC+0100 Viktor Szakats (harbour.01 syenar.hu)
+  * src/rtl/listbox.prg
+    ! LISTBOX(): Fixed RTE (and 5.3 incompatibility) when
+      non-logical/non-NIL type is passed as 5th parameter.
+      This makes the ListBox() example included in 5.3 NG behave
+      exactly the same in Harbour as in C5.3. (Yes, the
+      example passes wrong parameter, plus it has a compiler
+      stopping typo, and it still RTEs even after the fix,
+      so better find some better example.)
+
 2011-01-30 00:27 UTC+0100 Viktor Szakats (harbour.01 syenar.hu)
   * src/rtl/listbox.prg
     ! Fixed casing in some words in license gone wrong in a very
diff --git a/harbour/src/rtl/listbox.prg b/harbour/src/rtl/listbox.prg
index 04e291962b..31bb25a7a9 100644
--- a/harbour/src/rtl/listbox.prg
+++ b/harbour/src/rtl/listbox.prg
@@ -1064,7 +1064,9 @@ METHOD New( nTop, nLeft, nBottom, nRight, lDropDown )
       RETURN NIL
    ENDIF
 
-   DEFAULT lDropDown TO .F.
+   IF !ISLOGICAL( lDropDown )
+      lDropDown := .F.
+   ENDIF
 
    ::nBottom   := nBottom
    ::nRight    := nRight