diff --git a/spacy/tests/regression/test_issue3521.py b/spacy/tests/regression/test_issue3521.py
new file mode 100644
index 000000000..a971ab4c6
--- /dev/null
+++ b/spacy/tests/regression/test_issue3521.py
@@ -0,0 +1,20 @@
+import pytest
+
+from spacy.lang.en import English
+
+
+@pytest.mark.parametrize(
+    "word",
+    [
+        "don't",
+        "don’t",
+        "I'd",
+        "I’d",
+    ],
+)
+def test_issue3521(fr_tokenizer, word):
+    nlp = English()
+
+    tok = nlp(word)[1]
+    assert tok.is_stop
+