1 files changed, 7 insertions, 1 deletions
diff --git a/Mono.Cecil/TypeSystem.cs b/Mono.Cecil/TypeSystem.cs
index 3b5202c..e16ec6f 100644
--- a/Mono.Cecil/TypeSystem.cs
+++ b/Mono.Cecil/TypeSystem.cs
@@ -184,7 +184,7 @@ namespace Mono.Cecil {
 					return typeRef;
 				var type = LookupType ("System", name);
 				type.etype = element_type;
-				type.IsValueType = true;
+				type.KnownValueType ();
 				return typeRef = type;
 			}
 		}
@@ -313,6 +313,12 @@ namespace Mono.Cecil {
 			return true;
 		}
 
+		public static void KnownValueType (this TypeReference type)
+		{
+			if (!type.IsDefinition)
+				type.IsValueType = true;
+		}
+
 		static bool IsCoreLibrary (AssemblyNameReference reference)
 		{
 			var name = reference.Name;