diff --git a/system/functions.php b/system/functions.php
index 6e58ca9d..56cf378b 100644
--- a/system/functions.php
+++ b/system/functions.php
@@ -1263,6 +1263,10 @@ function clearCache()
 
 		global $db;
 		$db->setClearCacheAfter(true);
+
+		if (function_exists('apcu_clear_cache')) {
+			apcu_clear_cache();
+		}
 	}
 
 	deleteDirectory(CACHE . 'signatures', ['index.html'], true);