diff --git a/src/internal/buffer/buffer.cc b/src/internal/buffer/buffer.cc
index 9a56cd8..97291e3 100644
--- a/src/internal/buffer/buffer.cc
+++ b/src/internal/buffer/buffer.cc
@@ -37,7 +37,7 @@ void Buffer::load(BEd &, vase::Shard *text) {
 void Buffer::append(BEd &ctx, vase::Shard *text, uint64_t line) {
   ctx.prev.buffername = name;
   ctx.prev.start = line;
-  ctx.prev.end = line + text->lines;
+  ctx.prev.end = line + text->lines + 1;
   root = vase::insert(&ctx.append, root, text, line);
   ctx.marks.insert(name, ctx.prev.start, ctx.prev.end);
   if (parser)