diff --git a/kitty/window.py b/kitty/window.py
index 9c7e4423b..c1e0f988d 100644
--- a/kitty/window.py
+++ b/kitty/window.py
@@ -101,7 +101,7 @@ def setup_colors(screen, opts):
 
 def text_sanitizer(as_ansi, add_wrap_markers):
     import re
-    pat = re.compile(r'\033[.+?m')
+    pat = re.compile(r'\033\[.+?m')
 
     def remove_wrap_markers(line):
         return line.replace('\r', '')