Improve cast fixes.
diff --git a/lib/zip.h b/lib/zip.h
index 04a391d..4ca9a77 100644
--- a/lib/zip.h
+++ b/lib/zip.h
@@ -148,7 +148,7 @@
 
 /* compression methods */
 
-#define ZIP_CM_DEFAULT	   65535  /* better of deflate or store */
+#define ZIP_CM_DEFAULT	      -1  /* better of deflate or store */
 #define ZIP_CM_STORE	       0  /* stored (uncompressed) */
 #define ZIP_CM_SHRINK	       1  /* shrunk */
 #define ZIP_CM_REDUCE_1	       2  /* reduced with factor 1 */