diff --git a/index.d.ts b/index.d.ts
index 2863718..b5e725e 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -173,7 +173,7 @@ export interface LiveProcessingStartedCallback {
 }
 
 export interface SubscriptionDroppedCallback<TSubscription> {
-    (subscription: TSubscription, reason: string, error?: Error);
+    (subscription: TSubscription, reason: string, error?: Error): void;
 }
 
 export interface EventStoreNodeConnection {
diff --git a/package.json b/package.json
index 3485f31..0196815 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "eventstore-node",
-  "version": "0.0.22",
+  "version": "0.0.23",
   "description": "A port of the EventStore .Net ClientAPI to Node.js",
   "main": "index.js",
   "types": "index.d.ts",