diff --git a/demo/regress/parse.cpp b/demo/regress/parse.cpp
index ae558e1f..13b8219b 100644
--- a/demo/regress/parse.cpp
+++ b/demo/regress/parse.cpp
@@ -311,7 +311,7 @@ void expand_escapes(string_type& s)
                   s[pos] = 0;
                }
                else
-                  s.insert(s.begin() + pos, (char)val);
+                  s.insert(s.begin() + pos, (string_type::value_type)val);
                i = pos;
             }
             else