diff --git a/src/lib.rs b/src/lib.rs
index 7beb228..008795c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,5 @@
-#![feature(test)]
+#![cfg_attr(test, feature(test))]
+
 #![allow(dead_code)]
 
 mod builtins;