diff --git a/openssl-sys/build.rs b/openssl-sys/build.rs
index 2fec59e4..17a07e52 100644
--- a/openssl-sys/build.rs
+++ b/openssl-sys/build.rs
@@ -1,4 +1,4 @@
-#![feature(env, path, core)]
+#![feature(env, old_path)]
 
 extern crate "pkg-config" as pkg_config;
 extern crate gcc;