diff --git a/ihatemoney/models.py b/ihatemoney/models.py
index 3e908fa8..0d471933 100644
--- a/ihatemoney/models.py
+++ b/ihatemoney/models.py
@@ -278,13 +278,13 @@ class Person(db.Model):
 
         def get_by_name(self, name, project):
             return Person.query.filter(Person.name == name)\
-                .filter(Project.id == project.id).one()
+                .filter(Person.project_id == project.id).one()
 
         def get(self, id, project=None):
             if not project:
                 project = g.project
             return Person.query.filter(Person.id == id)\
-                .filter(Project.id == project.id).one()
+                .filter(Person.project_id == project.id).one()
 
     query_class = PersonQuery