diff --git a/engine/Makefile b/engine/Makefile
index fd44b9020..182e27abd 100644
--- a/engine/Makefile
+++ b/engine/Makefile
@@ -81,7 +81,7 @@ MAKE:=$(MAKE) --no-print-directory SVNREVISION="$(SVNREVISION)" SVN_VERSION="$(S
 
 #update these to download+build a different version. this assumes that the url+subdirs etc contain a consistant version everywhere.
 JPEGVER=9c
-ZLIBVER=1.2.13
+ZLIBVER=1.3
 PNGVER=1.6.39
 OGGVER=1.3.4
 VORBISVER=1.3.6