diff --git a/format.cc b/format.cc
index c3170cd0..090e3f4d 100644
--- a/format.cc
+++ b/format.cc
@@ -633,7 +633,7 @@ void fmt::BasicFormatter<Char>::DoFormat() {
       } else {
         out = writer.GrowBuffer(1);
       }
-      *out = static_cast<char>(arg.int_value);
+      *out = static_cast<Char>(arg.int_value);
       break;
     }
     case STRING: {