diff --git a/utils/wxPython/src/gdi.i b/utils/wxPython/src/gdi.i
index 353c478c54..5e91e0cdd4 100644
--- a/utils/wxPython/src/gdi.i
+++ b/utils/wxPython/src/gdi.i
@@ -322,12 +322,6 @@ public:
 
 //----------------------------------------------------------------------
 
-#ifdef __WXMSW__
-typedef unsigned long wxDash;
-#else
-typedef char wxDash;
-#endif
-
 
 class wxPen {
 public:
diff --git a/utils/wxPython/src/my_typemaps.i b/utils/wxPython/src/my_typemaps.i
index 7efbaa8b69..fb0fdfc0aa 100644
--- a/utils/wxPython/src/my_typemaps.i
+++ b/utils/wxPython/src/my_typemaps.i
@@ -45,6 +45,17 @@
     delete [] $source;
 }
 
+// wxDash is a signed char
+%typemap(python,in) wxDash* choices  {
+    $target = (wxDash*)byte_LIST_helper($source);
+    if ($target == NULL) {
+        return NULL;
+    }
+}
+%typemap(python,freearg) wxDash* choices {
+    delete [] $source;
+}
+
 
 %typemap(python,in) int* choices  {
     $target = int_LIST_helper($source);
@@ -79,15 +90,6 @@
 }
 
 
-#ifdef __WXMSW__
-%typemap(python,in) wxDash* choices = unsigned long* choices;
-%typemap(python,freearg) wxDash* choices = unsigned long* choices;
-#else
-%typemap(python,in) wxDash* choices = byte* choices;
-%typemap(python,freearg) wxDash* choices = byte* choices;
-#endif
-
-
 %typemap(python,in) char** choices {
     $target = string_LIST_helper($source);
     if ($target == NULL) {