diff --git a/rebar.config b/rebar.config
index 97e4a61..a270ae5 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1,6 +1,8 @@
-{so_name, "geef.so"}.
+{port_specs, [
+     {"priv/geef.so", ["c_src/*.c"]}
+]}.
 
-{port_envs, [
+{port_env, [
       {"DRV_LDFLAGS", "$DRV_LDFLAGS -lz -lgit2"},
 
       %% OS X Leopard flags for 64-bit