diff --git a/Tools/parser/com2ann.py b/Tools/parser/com2ann.py
index 1f46e73d5f1..b5868f4340b 100644
--- a/Tools/parser/com2ann.py
+++ b/Tools/parser/com2ann.py
@@ -10,8 +10,8 @@ from io import BytesIO
 
 __all__ = ['com2ann', 'TYPE_COM']
 
-TYPE_COM = re.compile('\s*#\s*type\s*:.*$', flags=re.DOTALL)
-TRAIL_OR_COM = re.compile('\s*$|\s*#.*$', flags=re.DOTALL)
+TYPE_COM = re.compile(r'\s*#\s*type\s*:.*$', flags=re.DOTALL)
+TRAIL_OR_COM = re.compile(r'\s*$|\s*#.*$', flags=re.DOTALL)
 
 
 class _Data: