diff --git a/src/libcore/core.rc b/src/libcore/core.rc
index 142cd234bc6..13735d4fa97 100644
--- a/src/libcore/core.rc
+++ b/src/libcore/core.rc
@@ -82,7 +82,7 @@ pub mod float;
 pub mod f32;
 pub mod f64;
 
-pub mod unit;
+pub mod nil;
 pub mod bool;
 pub mod char;
 pub mod tuple;
diff --git a/src/libcore/unit.rs b/src/libcore/nil.rs
similarity index 100%
rename from src/libcore/unit.rs
rename to src/libcore/nil.rs