diff --git a/database/migrations/2021_04_15_070732_achievements_progress.php b/database/migrations/2021_04_15_070732_achievements_progress.php
index 65259a6..940645f 100644
--- a/database/migrations/2021_04_15_070732_achievements_progress.php
+++ b/database/migrations/2021_04_15_070732_achievements_progress.php
@@ -16,7 +16,7 @@ public function up()
             $table->integer('points')->default(0);
             $table->dateTime('unlocked_at')->nullable();
             $table->timestamps();
-            $table->index(['user_id', 'achievement_id']);
+            $table->unique(['user_id', 'achievement_id']);
         });
     }