diff --git a/.gitignore b/.gitignore
index 82f9275..85da9df 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 __pycache__/
 *.py[cod]
 *$py.class
+*.pyc
 
 # C extensions
 *.so
diff --git a/studies_base/models/study_study.py b/studies_base/models/study_study.py
index 18f1efd..e58b1e1 100644
--- a/studies_base/models/study_study.py
+++ b/studies_base/models/study_study.py
@@ -32,7 +32,7 @@ class StudyStudy(models.Model):
 
     recruitment_target_number = fields.Integer("Nombre de participants à recruter")
     recruitment_max_number = fields.Integer("Nombre limite de participations")
-    recruitment_eligibility_gender = fields.Many2many("study.gender", string="Genre")
+    recruitment_eligibility_gender = fields.Many2one("study.gender", string="Genre")
     recruitment_eligibility_age_min = fields.Integer("Âge min")
     recruitment_eligibility_age_max = fields.Integer("Âge max")
     recruitment_eligibility_condition_clinical_status = fields.Many2many("study.eligibility.condition.clinical.status", string="Statut de l'affectation (malade, ancien malade...)")
diff --git a/studies_base/views/study_study_views.xml b/studies_base/views/study_study_views.xml
index ea547b9..3e7deb7 100644
--- a/studies_base/views/study_study_views.xml
+++ b/studies_base/views/study_study_views.xml
@@ -78,7 +78,7 @@
                                 <group name="recruitment_left">
                                     <field name="recruitment_target_number" />
                                     <field name="recruitment_max_number" />
-                                    <field name="recruitment_eligibility_gender" widget="many2many_tags" />
+                                    <field name="recruitment_eligibility_gender" />
                                     <field name="recruitment_eligibility_age_min" />
                                     <field name="recruitment_eligibility_age_max" />
                                     <field name="recruitment_eligibility_condition_clinical_status" widget="many2many_tags" />