diff --git a/src/Interfaces.ts b/src/Interfaces.ts
index e24fbd5b..506032a1 100644
--- a/src/Interfaces.ts
+++ b/src/Interfaces.ts
@@ -46,7 +46,7 @@ export interface ITerminal extends IEventEmitter {
   log(text: string): void;
   reset(): void;
   showCursor(): void;
-  blankLine(cur?: boolean, isWrapped?: boolean);
+  blankLine(cur?: boolean, isWrapped?: boolean): [number, string, number];
 }
 
 /**