diff --git a/tests/test_discussion_truncate_layout.py b/tests/test_discussion_truncate_layout.py
index 223b55e6..4417cff0 100644
--- a/tests/test_discussion_truncate_layout.py
+++ b/tests/test_discussion_truncate_layout.py
@@ -4,7 +4,7 @@ from src import gui_2
 def test_keep_pairs_input_uses_adequate_width():
  src = inspect.getsource(gui_2)
  marker = "Keep Pairs:"
- idx = src.find(marker)
+ idx = src.rfind(marker)
  assert idx != -1, "Could not find Keep Pairs label in gui_2.py"
  snippet = src[idx:idx + 200]
  assert "set_next_item_width(80)" not in snippet, (