diff --git a/src/prompt_toolkit/layout/containers.py b/src/prompt_toolkit/layout/containers.py
index 19c134a42..8f2b9896a 100644
--- a/src/prompt_toolkit/layout/containers.py
+++ b/src/prompt_toolkit/layout/containers.py
@@ -2040,8 +2040,8 @@ def find_next_wrap(
             except IndexError:
                 return sys.maxsize, 0, []
 
-            char_pos -= fragment_list_len(line[:fragment])
-            line_part = [(style0, text0[char_pos:]), *line[fragment + 1 :]]
+            frag_char_pos = char_pos - fragment_list_len(line[:fragment])
+            line_part = [(style0, text0[frag_char_pos:]), *line[fragment + 1 :]]
             line_width = [fragment_list_width([frag]) for frag in line_part]
             line_width = [fragment_list_width([frag]) for frag in line_part]