diff --git a/bootstrap.sh b/bootstrap.sh
index b69a035de..7a8582333 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -48,7 +48,7 @@ ICU_VERSION="55.1"
 
 function install_mason_deps() {
     install ccache 3.3.0
-    install zlib system
+    install zlib 1.2.8
     install jpeg_turbo 1.5.1 libjpeg
     install libpng 1.6.28 libpng
     install libtiff 4.0.7 libtiff