diff --git a/src/ui/bigtext/line.py b/src/ui/bigtext/line.py
index 1929757..8bc7951 100644
--- a/src/ui/bigtext/line.py
+++ b/src/ui/bigtext/line.py
@@ -116,7 +116,7 @@ class Line:
             # todo there are many other character combinations that should be skipped
             while i < len(self._line) and unicodedata.category(self._line[i]) == "Mn":
                 self._char_to_column_cache[i] = result - 1
-                if not result in self._column_to_char_cache:
+                if (result - 1) not in self._column_to_char_cache:
                     self._column_to_char_cache[result - 1] = i
                 i = i + 1