diff --git a/Fmod5Sharp/BitStreams/BitStream.cs b/Fmod5Sharp/BitStreams/BitStream.cs
index c48fe4f..4e3128a 100644
--- a/Fmod5Sharp/BitStreams/BitStream.cs
+++ b/Fmod5Sharp/BitStreams/BitStream.cs
@@ -151,7 +151,7 @@ public static BitStream Create(byte[] buffer, Encoding encoding, bool MSB = fals
         /// <param name="path">File path</param>
         /// <param name="encoding">Encoding of the file, if null default <see cref="Encoding"/> will be used</param>
         /// <returns></returns>
-        public static BitStream CreateFromFile(string path, Encoding encoding = null)
+        public static BitStream CreateFromFile(string path, Encoding? encoding = null)
         {
             if (!File.Exists(path))
             {