diff --git a/spacy/strings.pyx b/spacy/strings.pyx
index b0f6cf5aa..defb6d6f4 100644
--- a/spacy/strings.pyx
+++ b/spacy/strings.pyx
@@ -3,7 +3,7 @@
 cimport cython
 
 from contextlib import contextmanager
-from typing import Iterator, List, Optional
+from typing import List, Optional
 
 from libc.stdint cimport uint32_t
 from libc.string cimport memcpy