diff --git a/src/Driver/ApcuDriver.php b/src/Driver/ApcuDriver.php
index 78e81ae..98c12b4 100644
--- a/src/Driver/ApcuDriver.php
+++ b/src/Driver/ApcuDriver.php
@@ -16,6 +16,13 @@
 
 namespace Aviat\Banker\Driver;
 
+use function apcu_add;
+use function apcu_clear_cache;
+use function apcu_delete;
+use function apcu_exists;
+use function apcu_fetch;
+use function apcu_store;
+
 use Aviat\Banker\Exception\CacheException;