diff --git a/back/src/Kyoo.Postgresql/DatabaseContext.cs b/back/src/Kyoo.Postgresql/DatabaseContext.cs
index 206497e2..8f728ce6 100644
--- a/back/src/Kyoo.Postgresql/DatabaseContext.cs
+++ b/back/src/Kyoo.Postgresql/DatabaseContext.cs
@@ -405,6 +405,7 @@ namespace Kyoo.Postgresql
 				.IsUnique();
 			modelBuilder.Entity<Episode>().HasIndex(x => x.Slug).IsUnique();
 			modelBuilder.Entity<User>().HasIndex(x => x.Slug).IsUnique();
+			modelBuilder.Entity<User>().HasIndex(x => x.Username).IsUnique();
 
 			modelBuilder.Entity<Movie>().Ignore(x => x.Links);