diff --git a/EPAServeur/Services/FormationService.cs b/EPAServeur/Services/FormationService.cs
index 147d9bb..e712c18 100644
--- a/EPAServeur/Services/FormationService.cs
+++ b/EPAServeur/Services/FormationService.cs
@@ -418,6 +418,11 @@ namespace EPAServeur.Services
                         return query.OrderBy(p => p.EstCertifiee);
                     else
                         return query.OrderByDescending(p => p.EstCertifiee);
+                case "participants":
+                    if (asc.Value)
+                        return query.OrderBy(p => p.ParticipationsFormation.Count);
+                    else
+                        return query.OrderByDescending(p => p.ParticipationsFormation.Count);
                 default:
                     if (asc.Value)
                         return query.OrderBy(p => p.Intitule);