diff --git a/src/bounds.rs b/src/bounds.rs
index 191f3e1..b4aa909 100644
--- a/src/bounds.rs
+++ b/src/bounds.rs
@@ -29,12 +29,16 @@ bounded_impl!(u8,    u8::MIN,    u8::MAX);
 bounded_impl!(u16,   u16::MIN,   u16::MAX);
 bounded_impl!(u32,   u32::MIN,   u32::MAX);
 bounded_impl!(u64,   u64::MIN,   u64::MAX);
+#[cfg(feature = "i128")]
+bounded_impl!(u128,  u128::MIN,  u128::MAX);
 
 bounded_impl!(isize, isize::MIN, isize::MAX);
 bounded_impl!(i8,    i8::MIN,    i8::MAX);
 bounded_impl!(i16,   i16::MIN,   i16::MAX);
 bounded_impl!(i32,   i32::MIN,   i32::MAX);
 bounded_impl!(i64,   i64::MIN,   i64::MAX);
+#[cfg(feature = "i128")]
+bounded_impl!(i128,  i128::MIN,  i128::MAX);
 
 impl<T: Bounded> Bounded for Wrapping<T> {
     fn min_value() -> Self { Wrapping(T::min_value()) }
@@ -89,6 +93,9 @@ fn wrapping_bounded() {
     }
 
     test_wrapping_bounded!(usize u8 u16 u32 u64 isize i8 i16 i32 i64);
+
+    #[cfg(feature = "i128")]
+    test_wrapping_bounded!(u128 i128);
 }
 
 #[test]