diff --git a/embuild.sh b/embuild.sh
index 81614037..536358c5 100755
--- a/embuild.sh
+++ b/embuild.sh
@@ -1,3 +1,3 @@
 #!/bin/sh
-/usr/lib/emscripten/em++ hyperweb.cpp -O3 -s LEGACY_GL_EMULATION=1 -s TOTAL_MEMORY=128*1024*1024 -std=c++11 -o hyper.html
+/usr/lib/emscripten/em++ hyperweb.cpp -O3 -s USE_ZLIB=1 -s LEGACY_GL_EMULATION=1 -s TOTAL_MEMORY=128*1024*1024 -std=c++11 -o hyper.html