diff --git a/interface/wx/numdlg.h b/interface/wx/numdlg.h
index b1bf88b005..e074b0b545 100644
--- a/interface/wx/numdlg.h
+++ b/interface/wx/numdlg.h
@@ -74,7 +74,7 @@ public:
         Returns the value that the user has entered if the user has pressed OK,
         or the original value if the user has pressed Cancel.
     */
-    wxString GetValue() const;
+    long GetValue() const;
 };