diff --git a/src/zeroconf/_dns.pxd b/src/zeroconf/_dns.pxd
index b28f7323..cd4f1f9e 100644
--- a/src/zeroconf/_dns.pxd
+++ b/src/zeroconf/_dns.pxd
@@ -98,11 +98,14 @@ cdef class DNSNsec(DNSRecord):
 
 cdef class DNSRRSet:
 
-    cdef _record_sets
+    cdef cython.list _record_sets
     cdef cython.dict _lookup
 
     @cython.locals(other=DNSRecord)
     cpdef suppresses(self, DNSRecord record)
 
-    @cython.locals(lookup=cython.dict)
+    @cython.locals(
+        record=DNSRecord,
+        record_sets=cython.list,
+    )
     cdef cython.dict _get_lookup(self)
diff --git a/src/zeroconf/_dns.py b/src/zeroconf/_dns.py
index ada6e9df..34d7fdb2 100644
--- a/src/zeroconf/_dns.py
+++ b/src/zeroconf/_dns.py
@@ -22,7 +22,7 @@
 
 import enum
 import socket
-from typing import TYPE_CHECKING, Any, Dict, Iterable, List, Optional, Union, cast
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, Union, cast
 
 from ._exceptions import AbstractMethodException
 from ._utils.net import _is_v6_address
@@ -516,7 +516,7 @@ class DNSRRSet:
 
     __slots__ = ('_record_sets', '_lookup')
 
-    def __init__(self, record_sets: Iterable[List[DNSRecord]]) -> None:
+    def __init__(self, record_sets: List[List[DNSRecord]]) -> None:
         """Create an RRset from records sets."""
         self._record_sets = record_sets
         self._lookup: Optional[Dict[DNSRecord, float]] = None
@@ -530,7 +530,10 @@ def _get_lookup(self) -> Dict[DNSRecord, float]:
         """Return the lookup table, building it if needed."""
         if self._lookup is None:
             # Build the hash table so we can lookup the record ttl
-            self._lookup = {record: record.ttl for record_sets in self._record_sets for record in record_sets}
+            self._lookup = {}
+            for record_sets in self._record_sets:
+                for record in record_sets:
+                    self._lookup[record] = record.ttl
         return self._lookup
 
     def suppresses(self, record: _DNSRecord) -> bool:
diff --git a/src/zeroconf/_handlers.py b/src/zeroconf/_handlers.py
index 5cb192de..bf1f6acb 100644
--- a/src/zeroconf/_handlers.py
+++ b/src/zeroconf/_handlers.py
@@ -322,7 +322,7 @@ def async_response(  # pylint: disable=unused-argument
         This function must be run in the event loop as it is not
         threadsafe.
         """
-        known_answers = DNSRRSet(msg.answers for msg in msgs if not msg.is_probe)
+        known_answers = DNSRRSet([msg.answers for msg in msgs if not msg.is_probe])
         query_res = _QueryResponse(self.cache, msgs)
 
         for msg in msgs: