diff --git a/dlls/msvcrt/undname.c b/dlls/msvcrt/undname.c
index 88782158bf4..7d79ca30dcf 100644
--- a/dlls/msvcrt/undname.c
+++ b/dlls/msvcrt/undname.c
@@ -772,6 +772,9 @@ static const char* get_extended_type(char c)
     case 'L': type_string = "__int128"; break;
     case 'M': type_string = "unsigned __int128"; break;
     case 'N': type_string = "bool"; break;
+    case 'Q': type_string = "char8_t"; break;
+    case 'S': type_string = "char16_t"; break;
+    case 'U': type_string = "char32_t"; break;
     case 'W': type_string = "wchar_t"; break;
     default:  type_string = NULL; break;
     }