diff --git a/moo/kernel/Class.moo b/moo/kernel/Class.moo
index 64da4ce..9606a55 100644
--- a/moo/kernel/Class.moo
+++ b/moo/kernel/Class.moo
@@ -37,3 +37,9 @@ class(#pointer,#limited) Class(Apex)
 	method nsup { ^self.nsup }
 	method nsdic { ^self.nsdic }
 }
+
+
+class(#pointer,#limited) Interface(Class)
+{
+### TODO: fill this class with methods
+}
diff --git a/moo/lib/gc.c b/moo/lib/gc.c
index 65f9210..199df6b 100644
--- a/moo/lib/gc.c
+++ b/moo/lib/gc.c
@@ -128,6 +128,15 @@ static kernel_class_info_t kernel_classes[] =
 	  MOO_OBJ_TYPE_OOP,
 	  MOO_OFFSETOF(moo_t, _class) },
 
+	{ 9,
+	  { 'I','n','t','e','r','f','a','c','e' },
+	  MOO_CLASS_SELFSPEC_FLAG_LIMITED,
+	  0,
+	  MOO_CLASS_NAMED_INSTVARS,
+	  1,
+	  MOO_OBJ_TYPE_OOP,
+	  MOO_OFFSETOF(moo_t, _interface) },
+
 	{ 6,
 	  { 'O','b','j','e','c','t' },
 	  0,
diff --git a/moo/lib/moo.h b/moo/lib/moo.h
index 9522b68..1f24afd 100644
--- a/moo/lib/moo.h
+++ b/moo/lib/moo.h
@@ -1384,15 +1384,16 @@ struct moo_t
 	moo_oop_class_t _apex; /* Apex */
 	moo_oop_class_t _undefined_object; /* UndefinedObject */
 	moo_oop_class_t _class; /* Class */
+	moo_oop_class_t _interface; /* Interface */
 	moo_oop_class_t _object; /* Object */
-	moo_oop_class_t _string; /* String */
 
+	moo_oop_class_t _string; /* String */
 	moo_oop_class_t _symbol; /* Symbol */
 	moo_oop_class_t _array; /* Array */
 	moo_oop_class_t _byte_array; /* ByteArray */
 	moo_oop_class_t _symbol_table; /* SymbolTable */
-	moo_oop_class_t _dictionary;
 
+	moo_oop_class_t _dictionary;
 	moo_oop_class_t _namespace; /* Namespace */
 	moo_oop_class_t _pool_dictionary; /* PoolDictionary */
 	moo_oop_class_t _method_dictionary; /* MethodDictionary */