diff --git a/app/models.py b/app/models.py
index 12c4b5f28..0d58a6611 100644
--- a/app/models.py
+++ b/app/models.py
@@ -543,8 +543,6 @@ class Service(db.Model, Versioned):
         nullable=True,
     )
     organization = db.relationship("Organization", backref="services")
-    service_sms_senders = db.relationship("ServiceSmsSender", back_populates="service")
-    inbound_number = db.relationship("InboundNumber", back_populates="service")
 
     notes = db.Column(db.Text, nullable=True)
     purchase_order_number = db.Column(db.String(255), nullable=True)
@@ -687,7 +685,10 @@ class InboundNumber(db.Model):
         index=True,
         nullable=True,
     )
-    service = db.relationship(Service, back_populates="inbound_number")
+    service = db.relationship(
+        Service,
+        backref=db.backref("inbound_number", uselist=False),
+    )
     active = db.Column(
         db.Boolean,
         index=False,
@@ -733,7 +734,10 @@ class ServiceSmsSender(db.Model):
         nullable=False,
         unique=False,
     )
-    service = db.relationship(Service, back_populates="service_sms_senders")
+    service = db.relationship(
+        Service,
+        backref=db.backref("service_sms_senders", uselist=True),
+    )
     is_default = db.Column(db.Boolean, nullable=False, default=True)
     archived = db.Column(db.Boolean, nullable=False, default=False)
     inbound_number_id = db.Column(
diff --git a/app/service/rest.py b/app/service/rest.py
index 112fe15e0..d30f79c5e 100644
--- a/app/service/rest.py
+++ b/app/service/rest.py
@@ -202,7 +202,9 @@ def get_service_by_id(service_id):
 
         data = service_schema.dump(fetched)
 
-    current_app.logger.info(f'>> SERVICE: {data["id"]}; sms_senders: {data["sms_senders_with_hints"]}')
+    current_app.logger.info(
+        f'>> SERVICE: {data["id"]}; sms_senders: {data["sms_senders_with_hints"]}'
+    )
     return jsonify(data=data)