diff --git a/src/libcore/to_str.rs b/src/libcore/to_str.rs
index db293647fc01..91f80ba7248a 100644
--- a/src/libcore/to_str.rs
+++ b/src/libcore/to_str.rs
@@ -1,13 +1,28 @@
 iface to_str { fn to_str() -> str; }
 
-impl of to_str for int {
-    fn to_str() -> str { int::str(self) }
+impl of to_str for i8 {
+    fn to_str() -> str { i8::str(self) }
 }
-impl of to_str for uint {
-    fn to_str() -> str { uint::str(self) }
+impl of to_str for i16 {
+    fn to_str() -> str { i16::str(self) }
+}
+impl of to_str for i32 {
+    fn to_str() -> str { i32::str(self) }
+}
+impl of to_str for i64 {
+    fn to_str() -> str { i64::str(self) }
 }
 impl of to_str for u8 {
-    fn to_str() -> str { uint::str(self as uint) }
+    fn to_str() -> str { u8::str(self) }
+}
+impl of to_str for u16 {
+    fn to_str() -> str { u16::str(self) }
+}
+impl of to_str for u32 {
+    fn to_str() -> str { u32::str(self) }
+}
+impl of to_str for u64 {
+    fn to_str() -> str { u64::str(self) }
 }
 impl of to_str for float {
     fn to_str() -> str { float::to_str(self, 4u) }