diff --git a/lib/services/schema-changer.service.ts b/lib/services/schema-changer.service.ts
index 6a2ff909..c85718dc 100644
--- a/lib/services/schema-changer.service.ts
+++ b/lib/services/schema-changer.service.ts
@@ -1,5 +1,6 @@
 import { Injectable } from '@angular/core';
 import { Subject }    from 'rxjs/Subject';
+import { Observable } from '@angular/core';
 
 @Injectable()
 export class SchemaChangerService {