diff --git a/spacy/matcher/phrasematcher.pxd b/spacy/matcher/phrasematcher.pxd
index 753b2da74..1bce70260 100644
--- a/spacy/matcher/phrasematcher.pxd
+++ b/spacy/matcher/phrasematcher.pxd
@@ -9,7 +9,7 @@ from ..vocab cimport Vocab
 
 
 cdef class PhraseMatcher:
-    cdef Vocab vocab
+    cdef readonly Vocab vocab
     cdef attr_id_t attr
     cdef object _callbacks
     cdef object _docs
diff --git a/spacy/tests/regression/test_issue4373.py b/spacy/tests/regression/test_issue4373.py
new file mode 100644
index 000000000..57d7547da
--- /dev/null
+++ b/spacy/tests/regression/test_issue4373.py
@@ -0,0 +1,13 @@
+# coding: utf8
+from __future__ import unicode_literals
+
+from spacy.matcher import Matcher, PhraseMatcher
+from spacy.vocab import Vocab
+
+
+def test_issue4373():
+    """Test that PhraseMatcher.vocab can be accessed (like Matcher.vocab)."""
+    matcher = Matcher(Vocab())
+    assert isinstance(matcher.vocab, Vocab)
+    matcher = PhraseMatcher(Vocab())
+    assert isinstance(matcher.vocab, Vocab)