diff --git a/src/eval.c b/src/eval.c
index 9adaa41..2ca6611 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -349,6 +349,7 @@
     {VV_NAME("fcs_choice",	 VAR_STRING), 0},
     {VV_NAME("beval_bufnr",	 VAR_NUMBER), VV_RO},
     {VV_NAME("beval_winnr",	 VAR_NUMBER), VV_RO},
+    {VV_NAME("beval_winid",	 VAR_NUMBER), VV_RO},
     {VV_NAME("beval_lnum",	 VAR_NUMBER), VV_RO},
     {VV_NAME("beval_col",	 VAR_NUMBER), VV_RO},
     {VV_NAME("beval_text",	 VAR_STRING), VV_RO},