diff --git a/src/libcore/num/u16.rs b/src/libcore/num/u16.rs
index 68e50e8a400ea..d7e320267c607 100644
--- a/src/libcore/num/u16.rs
+++ b/src/libcore/num/u16.rs
@@ -14,4 +14,4 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
-uint_module! { u16, i16, 16 }
+uint_module! { u16, 16 }
diff --git a/src/libcore/num/u32.rs b/src/libcore/num/u32.rs
index c1ee96b363c27..9a26a39d5b365 100644
--- a/src/libcore/num/u32.rs
+++ b/src/libcore/num/u32.rs
@@ -14,4 +14,4 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
-uint_module! { u32, i32, 32 }
+uint_module! { u32, 32 }
diff --git a/src/libcore/num/u64.rs b/src/libcore/num/u64.rs
index c0d18d850a796..e12c2c265420b 100644
--- a/src/libcore/num/u64.rs
+++ b/src/libcore/num/u64.rs
@@ -14,4 +14,4 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
-uint_module! { u64, i64, 64 }
+uint_module! { u64, 64 }
diff --git a/src/libcore/num/u8.rs b/src/libcore/num/u8.rs
index a60c480d810ea..0eb63bd9f3a9d 100644
--- a/src/libcore/num/u8.rs
+++ b/src/libcore/num/u8.rs
@@ -14,4 +14,4 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
-uint_module! { u8, i8, 8 }
+uint_module! { u8, 8 }
diff --git a/src/libcore/num/uint_macros.rs b/src/libcore/num/uint_macros.rs
index 16d84cf81e11d..9539a311390f6 100644
--- a/src/libcore/num/uint_macros.rs
+++ b/src/libcore/num/uint_macros.rs
@@ -10,7 +10,7 @@
 
 #![doc(hidden)]
 
-macro_rules! uint_module { ($T:ty, $T_SIGNED:ty, $bits:expr) => (
+macro_rules! uint_module { ($T:ty, $bits:expr) => (
 
 #[unstable(feature = "num_bits_bytes",
            reason = "may want to be an associated function",
diff --git a/src/libcore/num/usize.rs b/src/libcore/num/usize.rs
index a6a7be023ebf4..875ab32fa8c57 100644
--- a/src/libcore/num/usize.rs
+++ b/src/libcore/num/usize.rs
@@ -15,6 +15,6 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 
 #[cfg(target_pointer_width = "32")]
-uint_module! { usize, isize, 32 }
+uint_module! { usize, 32 }
 #[cfg(target_pointer_width = "64")]
-uint_module! { usize, isize, 64 }
+uint_module! { usize, 64 }