diff --git a/src/number.rs b/src/number.rs
index 88a56e8..776e432 100644
--- a/src/number.rs
+++ b/src/number.rs
@@ -19,7 +19,7 @@ pub trait Number : Zero + One + Add<Output=Self> + Sub<Output=Self> +
 
 
    /// The amount of Bytes required to represent this Number.
-   const BYTES: u8;
+   const BYTES: usize;
 
 
    /// Create a number from a given string and base radix.
@@ -757,7 +757,7 @@ macro_rules! int_number_trait_impl
          type StrRadixError = ::std::num::ParseIntError;
 
 
-         const BYTES: u8 = <$varType>::BYTES;
+         const BYTES: usize = <$varType>::BYTES;
 
 
          fn from_str_radix(src: &str, radix: u32) ->
@@ -780,7 +780,7 @@ macro_rules! float_number_trait_impl
          type StrRadixError = ::std::num::ParseFloatError;
 
 
-         const BYTES: u8 = $numBytes;
+         const BYTES: usize = $numBytes;
 
 
          fn from_str_radix(src: &str, radix: u32) ->