diff -rdu lua-5.1.3.orig/src/luaconf.h lua-5.1.3/src/luaconf.h
--- lua-5.1.3.orig/src/luaconf.h	2008-02-12 16:17:59.000000000 +0000
+++ lua-5.1.3/src/luaconf.h	2008-02-12 16:26:32.000000000 +0000
@@ -447,10 +447,10 @@
 @* can use.
 ** CHANGE it if you need lots of (Lua) stack space for your C
 ** functions. This limit is arbitrary; its only purpose is to stop C
-** functions to consume unlimited stack space.
+** functions to consume unlimited stack space. (must be smaller than
+** -LUA_REGISTRYINDEX)
 */
-#define LUAI_MCS_AUX	((int)(INT_MAX / (4*sizeof(LUA_NUMBER))))
-#define LUAI_MAXCSTACK	(LUAI_MCS_AUX > SHRT_MAX ? SHRT_MAX : LUAI_MCS_AUX)
+#define LUAI_MAXCSTACK	8000