diff --git a/src/libcore/tests/lib.rs b/src/libcore/tests/lib.rs
index 0049ed66a10..939afdcb982 100644
--- a/src/libcore/tests/lib.rs
+++ b/src/libcore/tests/lib.rs
@@ -52,6 +52,7 @@ extern crate test;
 
 mod any;
 mod array;
+mod ascii;
 mod atomic;
 mod cell;
 mod char;