diff --git a/src/lj_lex.c b/src/lj_lex.c
index ad3f1306..8409cd78 100644
--- a/src/lj_lex.c
+++ b/src/lj_lex.c
@@ -375,6 +375,7 @@ int lj_lex_setup(lua_State *L, LexState *ls)
   ls->vtop = 0;
   ls->bcstack = NULL;
   ls->sizebcstack = 0;
+  ls->tok = 0;
   ls->lookahead = TK_eof;  /* No look-ahead token. */
   ls->linenumber = 1;
   ls->lastline = 1;