diff --git a/ICSharpCode.Decompiler/ILAst/ILAstOptimizer.cs b/ICSharpCode.Decompiler/ILAst/ILAstOptimizer.cs
index 584d8335d..18cc956a0 100644
--- a/ICSharpCode.Decompiler/ILAst/ILAstOptimizer.cs
+++ b/ICSharpCode.Decompiler/ILAst/ILAstOptimizer.cs
@@ -355,7 +355,8 @@ namespace Decompiler.ControlFlow
 					}
 				}
 			}
-			result.Add(head);
+			if (nodes.Contains(head))
+				result.Add(head);
 			
 			return result;
 		}