diff --git a/main.py b/main.py
index b9f71b9..4672beb 100644
--- a/main.py
+++ b/main.py
@@ -76,7 +76,7 @@ def process_diff(diff, client=Client(), insert_issue_urls=False, parser=TodoPars
                     if line_number < len(file_lines):
                         # Duplicate the line to retain the comment syntax.
                         old_line = file_lines[line_number]
-                        remove = fr'{raw_issue.identifier}.*{raw_issue.title}'
+                        remove = fr'(?i:{raw_issue.identifier}).*{raw_issue.title}'
                         insert = f'Issue URL: {client.get_issue_url(new_issue_number)}'
                         new_line = re.sub(remove, insert, old_line)
                         # make sure the above operation worked as intended