diff --git a/src/common/config.cpp b/src/common/config.cpp
index 15d559eb65..660932e469 100644
--- a/src/common/config.cpp
+++ b/src/common/config.cpp
@@ -425,7 +425,7 @@ wxString wxExpandEnvVars(const wxString& str)
             else {
               // skip closing bracket unless the variables wasn't expanded
               if ( pszValue == NULL )
-                strResult << (char)bracket;
+                strResult << (wxChar)bracket;
               m++;
             }
           }