diff --git a/packages/lib/src/data/messages_core.ts b/packages/lib/src/data/messages_core.ts
index 36b85720..305905e4 100644
--- a/packages/lib/src/data/messages_core.ts
+++ b/packages/lib/src/data/messages_core.ts
@@ -102,8 +102,16 @@ export class Address {
 	 * Returns a string suitable for indexing the address in a Map
 	 * @returns unique string for this address
 	 */
-	index() {
-		return `${this.type}:${this.id}:${this.requestId}`;
+	requestIndex() {
+		return `${this.type}:${this.id}:${this.requestId}` as const;
+	}
+
+	/**
+	 * Returns a string suitable for indexing the address in a Map
+	 * @returns unique string for this address, excluding required id
+	 */
+	addressIndex() {
+		return `${this.type}:${this.id}` as const;
 	}
 
 	/**
diff --git a/packages/lib/src/link/link.ts b/packages/lib/src/link/link.ts
index ac15d5c6..b7bc8c02 100644
--- a/packages/lib/src/link/link.ts
+++ b/packages/lib/src/link/link.ts
@@ -219,7 +219,7 @@ export class Link {
 
 		if (!message.dst.addressedTo(this.connector.src)) {
 			if (message.type === "response" || message.type === "responseError") {
-				this._forwardedRequests.delete(message.dst.index());
+				this._forwardedRequests.delete(message.dst.requestIndex());
 			}
 			this._routeMessage(message, entry);
 			return;
@@ -566,7 +566,7 @@ export class Link {
 			src: message.src,
 			dst: message.dst,
 		};
-		this._forwardedRequests.set(message.src.index(), pending);
+		this._forwardedRequests.set(message.src.requestIndex(), pending);
 		this.connector.forward(message);
 	}