diff --git a/src/generic/filedlgg.cpp b/src/generic/filedlgg.cpp
index 9af9c6d17f..2bd623bd8c 100644
--- a/src/generic/filedlgg.cpp
+++ b/src/generic/filedlgg.cpp
@@ -264,7 +264,7 @@ wxString wxFileData::GetHint() const
     }
     else
     {
-        s += LongToString( m_size );
+        s += wxString::Format( "%ld", m_size );
         s += wxT(" bytes ");
     }