diff --git a/src/past/types/oldstr.py b/src/past/types/oldstr.py
index a477d884..5a0e3789 100644
--- a/src/past/types/oldstr.py
+++ b/src/past/types/oldstr.py
@@ -20,7 +20,7 @@ def __instancecheck__(cls, instance):
 
 
 def unescape(s):
-    """
+    r"""
     Interprets strings with escape sequences
 
     Example: