diff --git a/muck/models/dbref.py b/muck/models/dbref.py
index 9bf3c1e..afd3081 100644
--- a/muck/models/dbref.py
+++ b/muck/models/dbref.py
@@ -1,11 +1,19 @@
-from sqlalchemy import Column, Integer, String, ForeignKey, Boolean
+from sqlalchemy import Column, Integer, String, ForeignKey, Boolean, Enum as SQLEnum
 from sqlalchemy.orm import relationship
 from crudkit.core.base import CRUDMixin, Base
+from enum import Enum
+
+class ObjectType(str, Enum):
+    ROOM = "room"
+    THING = "thing"
+    EXIT = "exit"
+    PLAYER = "player"
+    PROGRAM = "program"
 
 class Dbref(Base, CRUDMixin):
     __tablename__ = "dbref"
 
-    type = Column(String, nullable=False)
+    type = Column(SQLEnum(ObjectType, name="object_type_enum"), nullable=False)
     name = Column(String, nullable=False)
     is_deleted = Column(Boolean, nullable=False, default=False)
 
@@ -23,20 +31,20 @@ class Dbref(Base, CRUDMixin):
     def __str__(self):
         return f"#{self.id} ({self.type}): {self.name}"
 
-    def is_type(self, *types: str) -> bool:
+    def is_type(self, *types: ObjectType) -> bool:
         return self.type in types
 
     @property
-    def is_room(self): return self.is_type("room")
+    def is_room(self): return self.is_type(ObjectType.ROOM)
 
     @property
-    def is_thing(self): return self.is_type("thing")
+    def is_thing(self): return self.is_type(ObjectType.THING)
 
     @property
-    def is_exit(self): return self.is_type("exit")
+    def is_exit(self): return self.is_type(ObjectType.EXIT)
 
     @property
-    def is_player(self): return self.is_type("player")
+    def is_player(self): return self.is_type(ObjectType.PLAYER)
 
     @property
-    def is_program(self): return self.is_type("programI ho")
+    def is_program(self): return self.is_type(ObjectType.PROGRAM)