diff --git a/ICSharpCode.NRefactory/TypeSystem/Implementation/CompoundTypeDefinition.cs b/ICSharpCode.NRefactory/TypeSystem/Implementation/CompoundTypeDefinition.cs
index 0d9171d76d..adfc5b1683 100644
--- a/ICSharpCode.NRefactory/TypeSystem/Implementation/CompoundTypeDefinition.cs
+++ b/ICSharpCode.NRefactory/TypeSystem/Implementation/CompoundTypeDefinition.cs
@@ -85,6 +85,7 @@ namespace ICSharpCode.NRefactory.TypeSystem.Implementation
 					compound = new CompoundTypeDefinition(mainPart.ProjectContent, mainPart.Namespace, mainPart.Name);
 			}
 			compound.parts = parts;
+			compound.Kind = mainPart.Kind;
 			compound.Region = mainPart.Region;
 			compound.BodyRegion = mainPart.BodyRegion;
 			compound.TypeParameters.AddRange(mainPart.TypeParameters);