diff --git a/oxrdflib/_converter.py b/oxrdflib/_converter.py
index 6123680..f5ce721 100644
--- a/oxrdflib/_converter.py
+++ b/oxrdflib/_converter.py
@@ -1,15 +1,13 @@
-from typing import TYPE_CHECKING, Optional, Tuple, Union
+from typing import Optional, Tuple, Union
 
 import pyoxigraph as ox
 from rdflib import Graph
 from rdflib.graph import DATASET_DEFAULT_GRAPH_ID
+from rdflib.store import Store
 from rdflib.term import BNode, Literal, Node, URIRef
 
 from oxrdflib._type import _Quad, _Triple, _TriplePattern
 
-if TYPE_CHECKING:
-    from oxrdflib.store import OxigraphStore
-
 
 def to_ox(
     term: Optional[Union[Node, _Triple, _Quad, Graph]], context: Optional[Graph] = None
@@ -83,7 +81,7 @@ def to_ox_term_pattern(
 
 def from_ox_graph_name(
     graph_name: Union[ox.NamedNode, ox.BlankNode, ox.DefaultGraph],
-    store: "OxigraphStore",
+    store: Store,
 ) -> Graph:
     if isinstance(graph_name, ox.NamedNode):
         return Graph(identifier=URIRef(graph_name.value), store=store)
diff --git a/oxrdflib/store.py b/oxrdflib/store.py
index 95ebae3..1eeed82 100644
--- a/oxrdflib/store.py
+++ b/oxrdflib/store.py
@@ -103,7 +103,7 @@ def triples(
             return (
                 (
                     (from_ox(q.subject), from_ox(q.predicate), from_ox(q.object)),
-                    iter(((from_ox_graph_name(q.graph_name, self) if q.graph_name != ox.DefaultGraph() else None),)),
+                    iter(((from_ox_graph_name(q.graph_name, self)),)),
                 )
                 for q in self._inner.quads_for_pattern(*to_ox_quad_pattern(triple_pattern, context))
             )