diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index c8d22b26728..87a887da5da 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -1339,8 +1339,8 @@ module ts {
         PropertyExcludes = Value,
         EnumMemberExcludes = Value,
         FunctionExcludes = Value & ~(Function | ValueModule),
-        ClassExcludes = (Value | Type) & ~ValueModule,
-        InterfaceExcludes = Type & ~Interface,
+        ClassExcludes = (Value | Type) & ~(ValueModule | Interface),
+        InterfaceExcludes = Type & ~(Class | Interface),
         RegularEnumExcludes = (Value | Type) & ~(RegularEnum | ValueModule), // regular enums merge only with regular enums and modules
         ConstEnumExcludes = (Value | Type) & ~ConstEnum, // const enums merge only with const enums
         ValueModuleExcludes = Value & ~(Function | Class | RegularEnum | ValueModule),