diff --git a/coworking_relation/models/relation.py b/coworking_relation/models/relation.py
index 99d167a..ef8d88b 100644
--- a/coworking_relation/models/relation.py
+++ b/coworking_relation/models/relation.py
@@ -28,5 +28,5 @@ class CoworkerRelation(models.Model):
     @api.constrains('coworker1', 'coworker2')
     def _check_if_coworker_is_same(self):
         """Test si coworker1 est identique à coworker2"""
-        if not self.coworker1 != self.coworker2:
+        if self.coworker1 == self.coworker2:
             raise ValidationError(_('Coworker1 is same coworker2'))