diff --git a/src/types.ts b/src/types.ts
index 5dbc4116..36b03204 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -115,6 +115,7 @@ type WindowDataType = {
     sessionid : string,
     windowid : string,
     curremote : RemotePtrType,
+    nextlinenum : number,
     lines : LineType[],
     cmds : CmdDataType[],