diff --git a/types/pg/index.d.ts b/types/pg/index.d.ts
index 48287d089c05408..f2d21fb425d9fac 100644
--- a/types/pg/index.d.ts
+++ b/types/pg/index.d.ts
@@ -203,7 +203,7 @@ export class Pool extends events.EventEmitter {
     ): void;
     // tslint:enable:no-unnecessary-generics
 
-    on(event: 'error', listener: (err: Error, client: PoolClient) => void): this;
+    on(event: 'release' | 'error', listener: (err: Error, client: PoolClient) => void): this;
     on(event: 'connect' | 'acquire' | 'remove', listener: (client: PoolClient) => void): this;
 }