diff --git a/src/Humanizer/Bytes/ByteSize.cs b/src/Humanizer/Bytes/ByteSize.cs
index 2c9fe5e36..1a2597926 100644
--- a/src/Humanizer/Bytes/ByteSize.cs
+++ b/src/Humanizer/Bytes/ByteSize.cs
@@ -30,7 +30,7 @@ namespace Humanizer.Bytes
     /// Represents a byte size value.
     /// </summary>
 #pragma warning disable 1591
-    public struct ByteSize : IComparable<ByteSize>, IEquatable<ByteSize>, IComparable
+    public struct ByteSize : IComparable<ByteSize>, IEquatable<ByteSize>, IComparable, IFormattable
     {
         public static readonly ByteSize MinValue = FromBits(long.MinValue);
         public static readonly ByteSize MaxValue = FromBits(long.MaxValue);