diff --git a/boards/templatetags/board.py b/boards/templatetags/board.py
--- a/boards/templatetags/board.py
+++ b/boards/templatetags/board.py
@@ -106,7 +106,7 @@ def truncate_lines(text, length):
             # It's an actual non-HTML word or char
             current_len += 1
             if current_len == length:
-                end_text_pos = pos
+                end_text_pos = m.start(0)
             continue
         # Check for tag
         tag = REGEX_TAG.match(m.group(0))