diff --git a/rebar.config b/rebar.config
index 32cbe96..5b7cead 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1,6 +1,7 @@
 {erl_opts, [debug_info]}.
 
-{port_env, [{"CFLAGS", "-g -O2 -Wall"}]}.
+{port_env, [{"CFLAGS", "-g -O2 -Wall"},
+            {"LDFLAGS","$LDFLAGS -lz"}]}.
 
 {port_specs, [{"priv/lib/ezlib_drv.so", ["c_src/ezlib_drv.c"]}]}.