diff --git a/rebar.config b/rebar.config
index e3e3e3c..b710bd5 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1,3 +1,3 @@
 {require_otp_vsn, "R14"}.
-{port_sources, ["c_src/*.c"]}.
-{so_name, "esqlite3_nif.so"}.
+{port_env, [{"CFLAGS", "$CFLAGS -DSQLITE_THREADSAFE=1 -DSQLITE_USE_URI"}]}.
+{port_specs, [{"priv/esqlite3_nif.so", ["c_src/*.c"]}]}.