diff --git a/app/Http/Controllers/SignupController.php b/app/Http/Controllers/SignupController.php
index 39c815d5..2e4b0055 100644
--- a/app/Http/Controllers/SignupController.php
+++ b/app/Http/Controllers/SignupController.php
@@ -42,7 +42,7 @@ class SignupController extends Controller
 
         $invite = Invite::where('code', '=', $code)->first();
 
-        if (!$invite || $invite->claimed()) {
+        if (!$invite || $invite->is_claimed) {
             throw new BadRequestHttpException();
         }
 
@@ -67,7 +67,7 @@ class SignupController extends Controller
 
         $invite = Invite::where('code', '=', $code)->first();
 
-        if (!$invite || $invite->claimed()) {
+        if (!$invite || $invite->is_claimed) {
             throw new BadRequestHttpException();
         }
 
diff --git a/app/Models/Invite.php b/app/Models/Invite.php
index 2a4ea330..a77bb484 100644
--- a/app/Models/Invite.php
+++ b/app/Models/Invite.php
@@ -60,7 +60,7 @@ class Invite extends Model
      *
      * @return bool
      */
-    public function claimed()
+    public function getIsClaimedAttribute()
     {
         return $this->claimed_at !== null;
     }