diff --git a/ICSharpCode.Decompiler/TypeSystem/TupleType.cs b/ICSharpCode.Decompiler/TypeSystem/TupleType.cs
index a1267f6bf..7576e817d 100644
--- a/ICSharpCode.Decompiler/TypeSystem/TupleType.cs
+++ b/ICSharpCode.Decompiler/TypeSystem/TupleType.cs
@@ -115,8 +115,9 @@ namespace ICSharpCode.Decompiler.TypeSystem
 				case TypeKind.Tuple:
 					tupleCardinality = ((TupleType)type).ElementTypes.Length;
 					return true;
-				case TypeKind.Class:
 				case TypeKind.Struct:
+					// C# requires System.ValueTuple to be a struct, so a class of that name is
+					// some other type that happens to share it and must not become tuple syntax.
 					if (type.Namespace == "System" && type.Name == "ValueTuple")
 					{
 						int tpc = type.TypeParameterCount;