diff --git a/src/browser/public/Terminal.ts b/src/browser/public/Terminal.ts
index 4db82240..6c485a5c 100644
--- a/src/browser/public/Terminal.ts
+++ b/src/browser/public/Terminal.ts
@@ -60,7 +60,7 @@ export class Terminal implements ITerminalApi {
   public get buffer(): IBufferNamespaceApi {
     this._checkProposedApi();
     if (!this._buffer) {
-      return new BufferNamespaceApi(this._core.buffers);
+      this._buffer = new BufferNamespaceApi(this._core.buffers);
     }
     return this._buffer;
   }