1 files changed, 1 insertions, 1 deletions

diff --git a/src/lj_err.c b/src/lj_err.c
index 02a7c4cc..da2555f9 100644
--- a/src/lj_err.c
+++ b/src/lj_err.c
@@ -677,7 +677,7 @@ LJ_NORET LJ_NOINLINE static void err_argmsg(lua_State *L, int narg,
   const char *fname = "?";
   const char *ftype = getfuncname(L, L->base - 1, &fname);
   if (narg < 0 && narg > LUA_REGISTRYINDEX)
-    narg = (L->top - L->base) + narg + 1;
+    narg = cast_int(L->top - L->base) + narg + 1;
   if (ftype && ftype[3] == 'h' && --narg == 0)  /* Check for "method". */
     msg = lj_str_pushf(L, err2msg(LJ_ERR_BADSELF), fname, msg);
   else