diff --git a/src/agents/agent-meta.ts b/src/agents/agent-meta.ts
index 4b713e8..3484a3b 100644
--- a/src/agents/agent-meta.ts
+++ b/src/agents/agent-meta.ts
@@ -32,5 +32,7 @@ export enum ReservedAgentProperty {
     /** `AgentManager.game` */
     GAME = "game",
     /** Used by `InactiveAgentProxy` */
-    TEMP_VALUES = "tempValues"
+    TEMP_VALUES = "tempValues",
+    /** Used by `AgentReference` */
+    REF_ID = "refId"
 }
diff --git a/src/agents/impl/inactive-agent-proxy.ts b/src/agents/impl/inactive-agent-proxy.ts
index 8a8023c..b96343a 100644
--- a/src/agents/impl/inactive-agent-proxy.ts
+++ b/src/agents/impl/inactive-agent-proxy.ts
@@ -56,7 +56,7 @@ export const buildInactiveAgentProxy = (agent: Agent): Agent => {
 
             if (
                 property !== ReservedAgentProperty.META &&
-                property !== "refId" && // TODO - Remove refId
+                property !== ReservedAgentProperty.REF_ID &&
                 !ContextManager.isContextStatic()
             ) {
                 throw new RegalError(