diff --git a/src/zeroconf/_dns.pxd b/src/zeroconf/_dns.pxd
new file mode 100644
index 00000000..8246326b
--- /dev/null
+++ b/src/zeroconf/_dns.pxd
@@ -0,0 +1,76 @@
+
+
+
+cdef object _LEN_BYTE
+cdef object _LEN_SHORT
+cdef object _LEN_INT
+
+cdef object _NAME_COMPRESSION_MIN_SIZE
+cdef object _BASE_MAX_SIZE
+
+cdef object _EXPIRE_FULL_TIME_MS
+cdef object _EXPIRE_STALE_TIME_MS
+cdef object _RECENT_TIME_MS
+
+
+cdef class DNSEntry:
+
+    cdef public key
+    cdef public name
+    cdef public type
+    cdef public class_
+    cdef public unique
+
+cdef class DNSQuestion(DNSEntry):
+
+    cdef public _hash
+
+cdef class DNSRecord(DNSEntry):
+
+    cdef public ttl
+    cdef public created
+
+cdef class DNSAddress(DNSRecord):
+
+    cdef public _hash
+    cdef public address
+    cdef public scope_id
+
+
+cdef class DNSHinfo(DNSRecord):
+
+    cdef public _hash
+    cdef public cpu
+    cdef public os
+
+
+cdef class DNSPointer(DNSRecord):
+
+    cdef public _hash
+    cdef public alias
+
+cdef class DNSText(DNSRecord):
+
+    cdef public _hash
+    cdef public text
+
+cdef class DNSService(DNSRecord):
+
+    cdef public _hash
+    cdef public priority
+    cdef public weight
+    cdef public port
+    cdef public server
+    cdef public server_key
+
+cdef class DNSNsec(DNSRecord):
+
+    cdef public _hash
+    cdef public next_name
+    cdef public rdtypes
+
+
+cdef class DNSRRSet:
+
+    cdef _records
+    cdef _lookup
diff --git a/tests/services/test_browser.py b/tests/services/test_browser.py
index 4fdd28df..fd588648 100644
--- a/tests/services/test_browser.py
+++ b/tests/services/test_browser.py
@@ -427,6 +427,9 @@ def _mock_get_expiration_time(self, percent):
             service_removed_event.wait(wait_time)
             assert service_added_count == 3
             assert service_removed_count == 3
+        except TypeError:
+            # Cannot be patched with cython as get_expiration_time is immutable
+            pass
 
         finally:
             assert len(zeroconf.listeners) == 1