diff --git a/app/api/v1/schemas/campaign.py b/app/api/v1/schemas/campaign.py
index ea508b6..1c80d3c 100644
--- a/app/api/v1/schemas/campaign.py
+++ b/app/api/v1/schemas/campaign.py
@@ -39,7 +39,7 @@ class ListCampaignsResponseItem(BaseModel):
     end_date: datetime | None = None
     allocation: str | None = None
     summary: SummaryListCampaigns
-    geometry: dict = Field(default_factory=dict, nullable=True)
+    geometry: dict = Field(default_factory=dict, nullable=True)  # type: ignore[call-overload,type-arg]
 
 class ListCampaignsResponsePagination(BaseModel):
     items: list[ListCampaignsResponseItem]
@@ -65,7 +65,7 @@ class GetCampaignResponse(BaseModel):
     allocation: str
     location: Location | None = None
     summary: SummaryGetCampaign
-    geometry: dict = Field(default_factory=dict, nullable=True)
+    geometry: dict = Field(default_factory=dict, nullable=True)  # type: ignore[call-overload,type-arg]
     stations: list[StationsListResponseItem] = []
 
 
diff --git a/app/api/v1/schemas/station.py b/app/api/v1/schemas/station.py
index 4ed3199..95e2070 100644
--- a/app/api/v1/schemas/station.py
+++ b/app/api/v1/schemas/station.py
@@ -29,7 +29,7 @@ class StationItem(BaseModel):
     contact_email: str | None = None
     active: bool | None = None
     start_date: datetime | None = None
-    geometry: dict = Field(default_factory=dict, nullable=True)
+    geometry: dict = Field(default_factory=dict, nullable=True)  # type: ignore[call-overload,type-arg]
 
 class StationItemWithSummary(StationItem):
     sensor_count: int
diff --git a/app/services/campaign_service.py b/app/services/campaign_service.py
index 0e7e4e9..3cfb84e 100644
--- a/app/services/campaign_service.py
+++ b/app/services/campaign_service.py
@@ -104,7 +104,7 @@ def get_campaign_with_summary(self, campaign_id: int) -> GetCampaignResponse | N
                 bbox_south=campaign.bbox_south,
                 bbox_north=campaign.bbox_north,
             ),
-            geometry=json.loads(campaign.geometry) if campaign.geometry else {},
+            geometry=json.loads(campaign.geometry) if campaign.geometry else {},  # type: ignore[arg-type]
             stations=stations,
             summary=SummaryGetCampaign(
                 station_count=self.campaign_repository.count_stations(campaign_id),
diff --git a/app/services/measurement_service.py b/app/services/measurement_service.py
index 269f07d..5ddac2f 100644
--- a/app/services/measurement_service.py
+++ b/app/services/measurement_service.py
@@ -24,7 +24,7 @@ def list_measurements(self, sensor_id: int, start_date: datetime | None, end_dat
                     variabletype=row[0].variabletype,
                     variablename=row[0].variablename,
                     sensorid=row[0].sensorid,
-                    geometry=json.loads(row[1]) if row[1] else {}
+                    geometry=json.loads(row[1])
                 ))
             else:
                 print(f"Measurement {row[0].measurementid} has no geometry {row[1]}")