diff --git a/DHParser/stringview.py b/DHParser/stringview.py
index 309a8499fe54c7594ab0120e7b8707b63d5b8ab4..a991c35f938f2790837df0bd141d0c578d6d2c11 100644
--- a/DHParser/stringview.py
+++ b/DHParser/stringview.py
@@ -32,7 +32,7 @@ speedup. The modules comes with a ``stringview.pxd`` that contains some type
 declarations to more fully exploit the benefits of the Cython-compiler.
 """
 
-from typing import Optional, Union, Iterable, Tuple, List, cast
+from typing import Optional, Union, Iterable, Tuple, List, Sequence, cast
 
 try:
     import cython