diff --git a/src/common/cshelp.cpp b/src/common/cshelp.cpp
index 360a7f86be..a532528bb1 100644
--- a/src/common/cshelp.cpp
+++ b/src/common/cshelp.cpp
@@ -352,8 +352,9 @@ void wxSimpleHelpProvider::AddHelp(wxWindowBase *window, const wxString& text)
 
 void wxSimpleHelpProvider::AddHelp(wxWindowID id, const wxString& text)
 {
-    m_hashIds.erase((long)id);
-    m_hashIds[id] = text;
+    wxLongToStringHashMap::const_key_type key = (wxLongToStringHashMap::const_key_type)id;
+    m_hashIds.erase(key);
+    m_hashIds[key] = text;
 }
 
 // removes the association