diff --git a/src/Settings/MemoryCacheSettingsRepository.php b/src/Settings/MemoryCacheSettingsRepository.php
index 13cb5f9eb..1328e282e 100644
--- a/src/Settings/MemoryCacheSettingsRepository.php
+++ b/src/Settings/MemoryCacheSettingsRepository.php
@@ -24,7 +24,7 @@ class MemoryCacheSettingsRepository implements SettingsRepositoryInterface
         $this->inner = $inner;
     }
 
-    public function all()
+    public function all(): array
     {
         if (! $this->isCached) {
             $this->cache = $this->inner->all();