diff --git a/CCIProvider/OperationHelper.cs b/CCIProvider/OperationHelper.cs
index 22dfb724..5d80f975 100644
--- a/CCIProvider/OperationHelper.cs
+++ b/CCIProvider/OperationHelper.cs
@@ -109,9 +109,9 @@ public static BasicOperation ToBasicOperation(Cci.OperationCode opcode)
 		public static ConvertOperation ToConvertOperation(Cci.OperationCode opcode)
 		{
 			switch (opcode)
-			{
-				case Cci.OperationCode.Castclass:
-				case Cci.OperationCode.Isinst:		return ConvertOperation.Cast;
+			{					
+				case Cci.OperationCode.Isinst:	    return  ConvertOperation.IsInst;
+				case Cci.OperationCode.Castclass:	return ConvertOperation.Cast;
 				case Cci.OperationCode.Box:			return ConvertOperation.Box;
 				case Cci.OperationCode.Unbox:		return ConvertOperation.UnboxPtr;
 				case Cci.OperationCode.Unbox_Any:	return ConvertOperation.Unbox;
diff --git a/MetadataProvider/OperationHelper.cs b/MetadataProvider/OperationHelper.cs
index c4999197..eb27025a 100644
--- a/MetadataProvider/OperationHelper.cs
+++ b/MetadataProvider/OperationHelper.cs
@@ -110,8 +110,8 @@ public static ConvertOperation ToConvertOperation(SRM.ILOpCode opcode)
 		{
 			switch (opcode)
 			{
-				case SRM.ILOpCode.Castclass:
-				case SRM.ILOpCode.Isinst:		 return ConvertOperation.Cast;
+				case SRM.ILOpCode.Isinst:		 return  ConvertOperation.IsInst;
+				case SRM.ILOpCode.Castclass:     return ConvertOperation.Cast;
 				case SRM.ILOpCode.Box:			 return ConvertOperation.Box;
 				case SRM.ILOpCode.Unbox:		 return ConvertOperation.UnboxPtr;
 				case SRM.ILOpCode.Unbox_any:	 return ConvertOperation.Unbox;
diff --git a/Model/Bytecode/Instructions.cs b/Model/Bytecode/Instructions.cs
index bb12534e..abca8f56 100644
--- a/Model/Bytecode/Instructions.cs
+++ b/Model/Bytecode/Instructions.cs
@@ -66,6 +66,7 @@ public enum BranchOperation
 	public enum ConvertOperation
 	{
 		Conv,
+		IsInst,
 		Cast,
 		Box,
 		Unbox,