diff --git a/spacy/matcher/matcher.pyx b/spacy/matcher/matcher.pyx
index fdce7e9fa..ee8efd688 100644
--- a/spacy/matcher/matcher.pyx
+++ b/spacy/matcher/matcher.pyx
@@ -203,7 +203,7 @@ cdef class Matcher:
                 else:
                     yield doc
 
-    def __call__(self, object doclike, as_spans=False):
+    def __call__(self, object doclike, *, as_spans=False):
         """Find all token sequences matching the supplied pattern.
 
         doclike (Doc or Span): The document to match over.
diff --git a/spacy/matcher/phrasematcher.pyx b/spacy/matcher/phrasematcher.pyx
index 6658c713e..44dda115b 100644
--- a/spacy/matcher/phrasematcher.pyx
+++ b/spacy/matcher/phrasematcher.pyx
@@ -217,7 +217,7 @@ cdef class PhraseMatcher:
                 result = internal_node
             map_set(self.mem, <MapStruct*>result, self.vocab.strings[key], NULL)
 
-    def __call__(self, doc, as_spans=False):
+    def __call__(self, doc, *, as_spans=False):
         """Find all sequences matching the supplied patterns on the `Doc`.
 
         doc (Doc): The document to match over.