diff --git a/src/vs/platform/terminal/node/ptyService.ts b/src/vs/platform/terminal/node/ptyService.ts
index 01aa9bc3866..8b473584b1d 100644
--- a/src/vs/platform/terminal/node/ptyService.ts
+++ b/src/vs/platform/terminal/node/ptyService.ts
@@ -160,7 +160,7 @@ export class PtyService extends Disposable implements IPtyService {
 		return this._throwIfNoPty(id).orphanQuestionReply();
 	}
 
-	processBinary(id: number, data: string): void {
+	async processBinary(id: number, data: string): Promise<void> {
 		return this._throwIfNoPty(id).writeBinary(data);
 	}