Consolidate cleanup hooks
diff --git a/rebar.config b/rebar.config
index 4bb4e7d..4fe9eb4 100644
--- a/rebar.config
+++ b/rebar.config
@@ -12,6 +12,5 @@
                    "$LDFLAGS $ERL_LDFLAGS -lpthread "
                    "-o priv/bcrypt\" > build_port.sh",
                    "build_port.sh"}}.
-{port_cleanup_script, "rm -f build_port.sh"}.
-{pre_hooks,  [{clean, "rm -f priv/bcrypt c_src/bcrypt_port.o"}]}.
+{pre_hooks,  [{clean, "rm -f priv/bcrypt build_port.sh"}]}.
 {post_hooks, [{compile, "sh build_port.sh"}]}.