diff --git a/CCIProvider/TypeExtractor.cs b/CCIProvider/TypeExtractor.cs
index 19e64dda..4567dd75 100644
--- a/CCIProvider/TypeExtractor.cs
+++ b/CCIProvider/TypeExtractor.cs
@@ -116,6 +116,8 @@ public TypeDefinition ExtractStruct(Cci.INamedTypeDefinition typedef, Cci.ISourc
 		{
 			var name = typedef.Name.Value;
 			var type = new TypeDefinition(name, TypeKind.ValueType, TypeDefinitionKind.Struct);
+			var basedef = typedef.BaseClasses.SingleOrDefault();
+			type.Base = ExtractType(basedef) as IBasicType;
 
 			ExtractAttributes(type.Attributes, typedef.Attributes);
 			ExtractGenericTypeParameters(type, typedef);