diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3158f9aa..61d74f81 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 All notable changes to `mateusjunges/laravel-acl` will be documented in this file.
 
+## 1.8.1
+- Add `->unique()` for permission slugs (fix #109)
 
 ## 1.8.0
 - Check for permissions using wildcard (fix [#77](https://github.com/jungessolutions/laravel-acl/issues/77))
diff --git a/src/database/migrations/2019_03_16_005237_create_permissions_table.php b/src/database/migrations/2019_03_16_005237_create_permissions_table.php
index 7317d4ed..06703ddd 100644
--- a/src/database/migrations/2019_03_16_005237_create_permissions_table.php
+++ b/src/database/migrations/2019_03_16_005237_create_permissions_table.php
@@ -17,7 +17,7 @@ public function up()
         Schema::create($permissionsTable, function (Blueprint $table) {
             $table->bigIncrements('id');
             $table->string('name')->unique()->nullable(false);
-            $table->string('slug')->nullable(false);
+            $table->string('slug')->unique()->nullable(false);
             $table->text('description')->nullable();
             $table->softDeletes();
             $table->timestamps();