diff --git a/lib/SimpleSAML/Store.php b/lib/SimpleSAML/Store.php
index 1d2b0691ff4c6e484dbaf633469fa53fa3904023..d5be90656fd91737839453c198b00a9bfa864c4d 100644
--- a/lib/SimpleSAML/Store.php
+++ b/lib/SimpleSAML/Store.php
@@ -35,7 +35,7 @@ abstract class Store
         }
 
         $config = Configuration::getInstance();
-        $storeType = $config->getString('store.type', null);
+        $storeType = $config->getString('store.type', 'phpsession');
 
         switch ($storeType) {
             case 'phpsession':