diff --git a/llimits.h b/llimits.h
index 2397fc3f..b5a70487 100644
--- a/llimits.h
+++ b/llimits.h
@@ -1,5 +1,5 @@
 /*
-** $Id: llimits.h,v 1.97 2012/03/28 18:27:25 roberto Exp roberto $
+** $Id: llimits.h,v 1.98 2012/05/11 14:10:50 roberto Exp roberto $
 ** Limits, basic types, and some other `installation-dependent' definitions
 ** See Copyright Notice in lua.h
 */
@@ -31,6 +31,8 @@ typedef unsigned char lu_byte;
 
 #define MAX_LUMEM	((lu_mem)(~(lu_mem)0)-2)
 
+#define MAX_LMEM	((l_mem) ((MAX_LUMEM >> 1) - 2))
+
 
 #define MAX_INT (INT_MAX-2)  /* maximum value of an int (-2 for safety) */