diff --git a/app/Repositories/AircraftRepository.php b/app/Repositories/AircraftRepository.php
index e6932cec..51156961 100644
--- a/app/Repositories/AircraftRepository.php
+++ b/app/Repositories/AircraftRepository.php
@@ -25,7 +25,7 @@ class AircraftRepository extends BaseRepository implements CacheableInterface
      * Return the list of aircraft formatted for a select box
      * @return array
      */
-    public function selectBoxList()
+    public function selectBoxList(): array
     {
         $retval = [];
         $items = $this->all();
diff --git a/app/Repositories/AirlineRepository.php b/app/Repositories/AirlineRepository.php
index 964fc8b5..f8d07a59 100644
--- a/app/Repositories/AirlineRepository.php
+++ b/app/Repositories/AirlineRepository.php
@@ -25,7 +25,7 @@ class AirlineRepository extends BaseRepository implements CacheableInterface
      * Return the list of airline formatted for a select box
      * @return array
      */
-    public function selectBoxList()
+    public function selectBoxList(): array
     {
         $retval = [];
         $items = $this->all();
diff --git a/app/Repositories/AirportRepository.php b/app/Repositories/AirportRepository.php
index d03b35f5..efa627a8 100644
--- a/app/Repositories/AirportRepository.php
+++ b/app/Repositories/AirportRepository.php
@@ -25,7 +25,7 @@ class AirportRepository extends BaseRepository implements CacheableInterface
      * Return the list of airports formatted for a select box
      * @return array
      */
-    public function selectBoxList()
+    public function selectBoxList(): array
     {
         $retval = [];
         $items = $this->all();