diff --git a/tcctok.h b/tcctok.h
index 032d947..c88dcc9 100644
--- a/tcctok.h
+++ b/tcctok.h
@@ -101,6 +101,9 @@
      DEF(TOK_STDCALL1, "stdcall")
      DEF(TOK_STDCALL2, "__stdcall")
      DEF(TOK_STDCALL3, "__stdcall__")
+     DEF(TOK_FASTCALL1, "fastcall")
+     DEF(TOK_FASTCALL2, "__fastcall")
+     DEF(TOK_FASTCALL3, "__fastcall__")
      DEF(TOK_DLLEXPORT, "dllexport")
      DEF(TOK_NORETURN1, "noreturn")
      DEF(TOK_NORETURN2, "__noreturn__")