diff --git a/src/c3nav/routing/api/positioning.py b/src/c3nav/routing/api/positioning.py
index 081e8a9d..13450ce5 100644
--- a/src/c3nav/routing/api/positioning.py
+++ b/src/c3nav/routing/api/positioning.py
@@ -9,11 +9,10 @@ from c3nav.api.auth import auth_responses
 from c3nav.mapdata.models.access import AccessPermission
 from c3nav.mapdata.schemas.models import CustomLocationSchema
 from c3nav.mapdata.utils.cache.stats import increment_cache_key
+from c3nav.routing.api.schemas import BSSIDSchema
 from c3nav.routing.locator import Locator
 from c3nav.routing.schemas import LocateRequestPeerSchema
 
-BSSIDSchema = Annotated[str, APIField(pattern=r"^[a-z0-9]{2}(:[a-z0-9]{2}){5}$", title="BSSID")]
-
 positioning_api_router = APIRouter(tags=["positioning"])
 
 
diff --git a/src/c3nav/routing/locator.py b/src/c3nav/routing/locator.py
index 5c30f4d4..590ee1d4 100644
--- a/src/c3nav/routing/locator.py
+++ b/src/c3nav/routing/locator.py
@@ -56,7 +56,7 @@ class LocatorPoint:
 class Locator:
     peers: list[LocatorPeer] = field(default_factory=list)
     peer_lookup: dict[BSSID, int] = field(default_factory=dict)
-    xyz: np.array = np.empty((0,))
+    xyz: np.array = field(default_factory=np.empty((0,)))
     spaces: dict[int, "LocatorSpace"] = field(default_factory=dict)
 
     @classmethod
diff --git a/src/c3nav/routing/schemas.py b/src/c3nav/routing/schemas.py
index 5ad080fc..78b04521 100644
--- a/src/c3nav/routing/schemas.py
+++ b/src/c3nav/routing/schemas.py
@@ -5,7 +5,7 @@ from pydantic import Field as APIField
 from pydantic import NegativeInt, PositiveInt
 
 from c3nav.api.utils import NonEmptyStr
-from c3nav.routing.api.positioning import BSSIDSchema
+from c3nav.routing.api.schemas import BSSIDSchema
 
 
 class LocateRequestPeerSchema(Schema):