diff --git a/ICSharpCode.Decompiler/IL/Instructions/ILInstruction.cs b/ICSharpCode.Decompiler/IL/Instructions/ILInstruction.cs
index 261cf9b63..789634a57 100644
--- a/ICSharpCode.Decompiler/IL/Instructions/ILInstruction.cs
+++ b/ICSharpCode.Decompiler/IL/Instructions/ILInstruction.cs
@@ -125,32 +125,35 @@ namespace ICSharpCode.Decompiler.IL
 			Debug.Assert(a == b);
 			return a;
 		}
-		
+
+#if DEBUG
 		/// <summary>
 		/// Gets whether this node (or any subnode) was modified since the last <c>ResetDirty()</c> call.
 		/// </summary>
 		/// <remarks>
-		/// IsDirty is used by the LoopingTransform, and must not be used by individual transforms within the loop.
+		/// IsDirty is used by the StatementTransform, and must not be used by individual transforms within the loop.
 		/// </remarks>
-		public bool IsDirty { get; private set; }
-		
-		protected void MakeDirty()
-		{
-			for (ILInstruction inst = this; inst != null && !inst.IsDirty; inst = inst.parent)
-				inst.IsDirty = true;
-		}
-		
+		internal bool IsDirty { get; private set; }
+
 		/// <summary>
 		/// Marks this node (and all subnodes) as <c>IsDirty=false</c>.
 		/// </summary>
-		/// <remarks>
-		/// IsDirty is used by the LoopingTransform, and must not be used by individual transforms within the loop.
-		/// </remarks>
-		public void ResetDirty()
+		internal void ResetDirty()
 		{
 			foreach (ILInstruction inst in Descendants)
 				inst.IsDirty = false;
 		}
+#endif
+
+		[Conditional("DEBUG")]
+		protected private void MakeDirty()
+		{
+#if DEBUG
+			for (ILInstruction inst = this; inst != null && !inst.IsDirty; inst = inst.parent) {
+				inst.IsDirty = true;
+			}
+#endif
+		}
 		
 		const InstructionFlags invalidFlags = (InstructionFlags)(-1);
 		
diff --git a/ICSharpCode.Decompiler/IL/Transforms/LoopingTransform.cs b/ICSharpCode.Decompiler/IL/Transforms/LoopingTransform.cs
deleted file mode 100644
index 27f761feb..000000000
--- a/ICSharpCode.Decompiler/IL/Transforms/LoopingTransform.cs
+++ /dev/null
@@ -1,61 +0,0 @@
-// Copyright (c) 2016 Siegfried Pammer
-// 
-// Permission is hereby granted, free of charge, to any person obtaining a copy of this
-// software and associated documentation files (the "Software"), to deal in the Software
-// without restriction, including without limitation the rights to use, copy, modify, merge,
-// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
-// to whom the Software is furnished to do so, subject to the following conditions:
-// 
-// The above copyright notice and this permission notice shall be included in all copies or
-// substantial portions of the Software.
-// 
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
-// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
-// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
-// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-// DEALINGS IN THE SOFTWARE.
-
-using System;
-using System.Collections.Generic;
-
-namespace ICSharpCode.Decompiler.IL.Transforms
-{
-	/// <summary>
-	/// Repeats the child transforms until the ILAst no longer changes (fixpoint iteration).
-	/// </summary>
-	public class LoopingBlockTransform : IBlockTransform
-	{
-		readonly IBlockTransform[] children;
-		bool running;
-
-		public LoopingBlockTransform(params IBlockTransform[] children)
-		{
-			this.children = children;
-		}
-		
-		public void Run(Block block, BlockTransformContext context)
-		{
-			if (running)
-				throw new InvalidOperationException("LoopingBlockTransform already running. Transforms (and the CSharpDecompiler) are neither thread-safe nor re-entrant.");
-			running = true;
-			try {
-				int count = 1;
-				do {
-					block.ResetDirty();
-					block.RunTransforms(children, context);
-					if (block.IsDirty)
-						context.Step($"Block is dirty; running loop iteration #{++count}.", block);
-				} while (block.IsDirty);
-			} finally {
-				running = false;
-			}
-		}
-
-		public IReadOnlyCollection<IBlockTransform> Transforms {
-			get { return children; }
-		}
-	}
-}
-
-