diff --git a/types/hystrixjs/index.d.ts b/types/hystrixjs/index.d.ts
index d3ee7bb416..140346bf8a 100644
--- a/types/hystrixjs/index.d.ts
+++ b/types/hystrixjs/index.d.ts
@@ -326,6 +326,7 @@ export interface CircuitFactory {
 
 export interface HystrixSSEStream {
     toObservable(): Rx.Observable<any>;
+    toCommandJson(metrics: any): string;
 }
 
 export const commandFactory: CommandFactory;