diff --git a/Source/zlib/INFBLOCK.C b/Source/zlib/INFBLOCK.C
index 7ffd009a..368e580d 100644
--- a/Source/zlib/INFBLOCK.C
+++ b/Source/zlib/INFBLOCK.C
@@ -46,7 +46,7 @@ local unsigned short inflate_mask[17] = {
     0x0000,
     0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
     0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
-};
+}; // use to reduce .data #define INFLATE_MASK(x, n) (x & (~((unsigned short) 0xFFFF << n)))
 local const char border[] = { /* Order of the bit length code lengths */
         16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};