diff --git a/src/pyob/xml_mixin.py b/src/pyob/xml_mixin.py
index ad7e26c..c82f920 100644
--- a/src/pyob/xml_mixin.py
+++ b/src/pyob/xml_mixin.py
@@ -267,7 +267,7 @@ def _attempt_line_by_line_match(
 
         replace_lines = replace.split("\n")
         code_lines = source.splitlines()
-        for i in range(len(code_lines) - len(search_lines_stripped) + 1):
+        for i in range(len(code_lines) - len(search_lines) + 1):
             match = True
             for j, sline in enumerate(search_lines_stripped):
                 if sline not in code_lines[i + j].strip():
@@ -276,13 +276,13 @@ def _attempt_line_by_line_match(
             if match:
                 # Apply indentation fix to replacement lines
                 fixed_replace = self._fix_replace_indentation(
-                    "\n".join(code_lines[i : i + len(search_lines_stripped)]),
+                    "\n".join(code_lines[i : i + len(search_lines)]),
                     "\n".join(replace_lines),
                 )
                 new_code_lines = (
                     code_lines[:i]
                     + fixed_replace.splitlines()
-                    + code_lines[i + len(search_lines_stripped) :]
+                    + code_lines[i + len(search_lines) :]
                 )
                 new_code = "\n".join(new_code_lines)
                 if not new_code.endswith("\n") and source.endswith("\n"):