diff --git a/mocha-dotnet/src/lib/Mocha.Core/InstanceKey.cs b/mocha-dotnet/src/lib/Mocha.Core/InstanceKey.cs
index 7e7c986..95052ec 100755
--- a/mocha-dotnet/src/lib/Mocha.Core/InstanceKey.cs
+++ b/mocha-dotnet/src/lib/Mocha.Core/InstanceKey.cs
@@ -103,7 +103,7 @@ namespace Mocha.Core
 							{
 								ClassIndex = ci;
 								InstanceIndex = -1;
-								SetDerivedDataString(split[1]);
+								_derivedDataString = split[1];
 								_isNotEmpty = true;
 							}
 							return;
@@ -124,11 +124,6 @@ namespace Mocha.Core
 			throw new ArgumentException("must be a string containing two integers separated by a '$' or a '!'");
 		}
 
-        private void SetDerivedDataString(string base64String)
-        {
-			_derivedDataString = base64String;
-        }
-
         public InstanceKey(int classIndex, int instanceIndex)
 		{
 			ClassIndex = classIndex;