diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index 6730c252f52..8b3124b0166 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -38,6 +38,7 @@ pub mod container;
 
 /* Core types and methods on primitives */
 
+mod unit;
 pub mod any;
 pub mod finally;
 pub mod raw;
diff --git a/src/libstd/unit.rs b/src/libcore/unit.rs
similarity index 90%
rename from src/libstd/unit.rs
rename to src/libcore/unit.rs
index 38307f415ac..f55cb2d2236 100644
--- a/src/libstd/unit.rs
+++ b/src/libcore/unit.rs
@@ -14,7 +14,6 @@
 use default::Default;
 #[cfg(not(test))]
 use cmp::{Eq, Equal, Ord, Ordering, TotalEq, TotalOrd};
-use fmt;
 
 #[cfg(not(test))]
 impl Eq for () {
@@ -44,9 +43,3 @@ impl Default for () {
     #[inline]
     fn default() -> () { () }
 }
-
-impl fmt::Show for () {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.pad("()")
-    }
-}
diff --git a/src/libstd/fmt/mod.rs b/src/libstd/fmt/mod.rs
index 8c999c2e2e3..7623da8734e 100644
--- a/src/libstd/fmt/mod.rs
+++ b/src/libstd/fmt/mod.rs
@@ -1250,6 +1250,12 @@ impl<'a> Show for &'a any::Any {
     fn fmt(&self, f: &mut Formatter) -> Result { f.pad("&Any") }
 }
 
+impl Show for () {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        f.pad("()")
+    }
+}
+
 impl Show for TypeId {
     fn fmt(&self, f: &mut Formatter) -> Result {
         write!(f.buf, "TypeId \\{ {} \\}", self.hash())
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index ef07fc2f995..5e71fc72dc9 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -190,7 +190,6 @@ pub mod prelude;
 #[path = "num/f32.rs"]   pub mod f32;
 #[path = "num/f64.rs"]   pub mod f64;
 
-pub mod unit;
 pub mod bool;
 pub mod tuple;