diff --git a/app/Models/License.php b/app/Models/License.php
index 87252eb..0e087c3 100644
--- a/app/Models/License.php
+++ b/app/Models/License.php
@@ -34,7 +34,7 @@ class License extends Model
         return $query->where('status', self::STATUS_ACTIVE);
     }
 
-    public function getMaxFileSizeAttribute()
+    public function getMaxFileSizeAttribute(): int
     {
         return [
             1 => 25000000, // 25 MB,
@@ -43,7 +43,7 @@ class License extends Model
         ][$this->meta['tier']];
     }
 
-    public function getCustomDomainLimitCountAttribute()
+    public function getCustomDomainLimitCountAttribute(): ?int
     {
         return [
             1 => 1,
diff --git a/app/Models/Workspace.php b/app/Models/Workspace.php
index f97f4a5..6543dc9 100644
--- a/app/Models/Workspace.php
+++ b/app/Models/Workspace.php
@@ -2,7 +2,6 @@
 
 namespace App\Models;
 
-use App\Http\Requests\AnswerFormRequest;
 use App\Models\Forms\Form;
 use App\Models\Traits\CachableAttributes;
 use App\Models\Traits\CachesAttributes;
@@ -71,7 +70,7 @@ class Workspace extends Model implements CachableAttributes
             return null;
         }
 
-        return $this->remember('custom_domain_count', 15 * 60, function(): int {
+        return $this->remember('custom_domain_count', 15 * 60, function(): ?int {
             foreach ($this->owners as $owner) {
                 if ($owner->is_subscribed) {
                     if ($license = $owner->activeLicense()) {