diff --git a/src/generic/helpext.cpp b/src/generic/helpext.cpp
index 8a07d4648c..30e80e6850 100644
--- a/src/generic/helpext.cpp
+++ b/src/generic/helpext.cpp
@@ -287,7 +287,7 @@ bool wxExtHelpController::LoadFile(const wxString& ifile)
    m_MapList = new wxList;
    m_NumOfEntries = 0;
 
-   FILE *input = wxFopen(mapFile.fn_str(),wxT("rt"));
+   FILE *input = wxFopen(mapFile,wxT("rt"));
    if(! input)
       return false;
    do