diff --git a/Source/zlib/deflate.c b/Source/zlib/deflate.c
index 0bd1270f..ae07b057 100644
--- a/Source/zlib/deflate.c
+++ b/Source/zlib/deflate.c
@@ -158,7 +158,7 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
         windowBits = -windowBits;
     }
     if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED ||
-        windowBits < 8 || windowBits > 15 || level < 0 || level > 9 ||
+        windowBits < 8 || windowBits > MAX_WBITS || level < 0 || level > 9 ||
 	strategy < 0 || strategy > Z_HUFFMAN_ONLY) {
         return Z_STREAM_ERROR;
     }