diff --git a/tpmcqr_service/models/gtfs.py b/tpmcqr_service/models/gtfs.py
index 9748665..facddca 100644
--- a/tpmcqr_service/models/gtfs.py
+++ b/tpmcqr_service/models/gtfs.py
@@ -49,10 +49,10 @@ class Trips(db.Model):
     __tablename__   = 'gtfs_trips'
     __table_args__  = { 'schema': 'public' }
 
-    id_trip         = Column(String(150), primary_key=True)
-    id_linea        = Column(String(150))
-    id_shape 		= Column(String(150))
-    service_id       = Column(String(50))
+    id_trip         = db.Column(db.String(150), primary_key=True)
+    id_linea        = db.Column(db.String(150))
+    id_shape 		= db.Column(db.String(150))
+    service_id       = db.Column(db.String(50))
 
 
 def find_shape_position(shape_id, lat, lng):