diff --git a/ldebug.c b/ldebug.c
index 93f2d53d..11d2b6a7 100644
--- a/ldebug.c
+++ b/ldebug.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldebug.c,v 2.147 2017/12/07 15:44:10 roberto Exp roberto $
+** $Id: ldebug.c,v 2.148 2017/12/13 18:32:09 roberto Exp roberto $
 ** Debug Interface
 ** See Copyright Notice in lua.h
 */
@@ -328,7 +328,7 @@ static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
         }
         else {
           ar->isvararg = f->l.p->is_vararg;
-          ar->nparams = f->l.p->numparams;
+          ar->nparams = f->l.p->numparams + f->l.p->is_vararg;
         }
         break;
       }
diff --git a/ldo.c b/ldo.c
index c06d7133..e58efa52 100644
--- a/ldo.c
+++ b/ldo.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldo.c,v 2.179 2017/12/11 12:43:40 roberto Exp roberto $
+** $Id: ldo.c,v 2.180 2017/12/12 11:57:30 roberto Exp roberto $
 ** Stack and Call structure of Lua
 ** See Copyright Notice in lua.h
 */
@@ -415,7 +415,7 @@ void luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func, int n) {
   for (i = 0; i < n; i++)  /* move down function and arguments */
     setobjs2s(L, ci->func + i, func + i);
   checkstackp(L, fsize, func);
-  for (; i < p->numparams - p->is_vararg; i++)
+  for (; i < p->numparams; i++)
     setnilvalue(s2v(ci->func + i));  /* complete missing parameters */
   if (p->is_vararg) {
     L->top -= (func - ci->func);  /* move down top */
@@ -469,7 +469,7 @@ void luaD_call (lua_State *L, StkId func, int nresults) {
       int n = cast_int(L->top - func) - 1;  /* number of real arguments */
       int fsize = p->maxstacksize;  /* frame size */
       checkstackp(L, fsize, func);
-      for (; n < p->numparams - p->is_vararg; n++)
+      for (; n < p->numparams; n++)
         setnilvalue(s2v(L->top++));  /* complete missing arguments */
       if (p->is_vararg)
         luaT_adjustvarargs(L, p, n);
diff --git a/lparser.c b/lparser.c
index a4a7e5fa..9d4d5eff 100644
--- a/lparser.c
+++ b/lparser.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lparser.c,v 2.170 2017/12/06 18:36:31 roberto Exp roberto $
+** $Id: lparser.c,v 2.171 2017/12/14 14:24:02 roberto Exp roberto $
 ** Lua Parser
 ** See Copyright Notice in lua.h
 */
@@ -765,7 +765,6 @@ static void parlist (LexState *ls) {
   FuncState *fs = ls->fs;
   Proto *f = fs->f;
   int nparams = 0;
-  f->is_vararg = 0;
   if (ls->t.token != ')') {  /* is 'parlist' not empty? */
     do {
       switch (ls->t.token) {
@@ -789,7 +788,7 @@ static void parlist (LexState *ls) {
     } while (!f->is_vararg && testnext(ls, ','));
   }
   adjustlocalvars(ls, nparams);
-  f->numparams = cast_byte(fs->nactvar);
+  f->numparams = cast_byte(fs->nactvar) - f->is_vararg;
   luaK_reserveregs(fs, fs->nactvar);  /* reserve register for parameters */
 }
 
@@ -975,7 +974,7 @@ static void simpleexp (LexState *ls, expdesc *v) {
     }
     case TK_DOTS: {  /* vararg */
       FuncState *fs = ls->fs;
-      int lastparam = fs->f->numparams - 1;
+      int lastparam = fs->f->numparams;
       check_condition(ls, fs->f->is_vararg,
                       "cannot use '...' outside a vararg function");
       init_exp(v, VVARARG, luaK_codeABC(fs, OP_VARARG, 0, 1, lastparam));
@@ -1676,7 +1675,7 @@ static void mainfunc (LexState *ls, FuncState *fs) {
   expdesc v;
   open_func(ls, fs, &bl);
   fs->f->is_vararg = 1;  /* main function is always declared vararg */
-  fs->f->numparams = 1;
+  fs->f->numparams = 0;
   new_localvarliteral(ls, "_ARG");
   adjustlocalvars(ls, 1);
   luaK_reserveregs(fs, 1);  /* reserve register for vararg */
diff --git a/ltm.c b/ltm.c
index d30bef2f..049c1712 100644
--- a/ltm.c
+++ b/ltm.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ltm.c,v 2.51 2017/11/30 15:37:16 roberto Exp roberto $
+** $Id: ltm.c,v 2.52 2017/12/13 18:32:09 roberto Exp roberto $
 ** Tag methods
 ** See Copyright Notice in lua.h
 */
@@ -219,7 +219,7 @@ void luaT_adjustvarargs (lua_State *L, Proto *p, int actual) {
   int i;
   Table *vtab;
   TValue nname;
-  int nfixparams = p->numparams - 1;  /* number of fixed parameters */
+  int nfixparams = p->numparams;  /* number of fixed parameters */
   actual -= nfixparams;  /* number of extra arguments */
   vtab = luaH_new(L);  /* create vararg table */
   sethvalue2s(L, L->top, vtab);  /* anchor it for resizing */