--- src/z_zone.c~	Sun Nov 12 14:59:30 2000
+++ src/z_zone.c	Sat May 31 13:55:27 2003
@@ -63,9 +63,6 @@
 // Alignment of zone memory (benefit may be negated by HEADER_SIZE, CHUNK_SIZE)
 #define CACHE_ALIGN 32
 
-// size of block header
-#define HEADER_SIZE 32
-
 // Minimum chunk size at which blocks are allocated
 #define CHUNK_SIZE 32
 
@@ -114,6 +111,9 @@
 #endif
 
 } memblock_t;
+
+// size of block header
+#define HEADER_SIZE sizeof(memblock_t)
 
 static memblock_t *rover;                // roving pointer to memory blocks
 static memblock_t *zone;                 // pointer to first block