diff --git a/src/SimpleSAML/Store/RedisStore.php b/src/SimpleSAML/Store/RedisStore.php
index ec144dac22..098add4864 100644
--- a/src/SimpleSAML/Store/RedisStore.php
+++ b/src/SimpleSAML/Store/RedisStore.php
@@ -102,6 +102,7 @@ public function __construct(?Client $redis = null)
                         'service' => $mastergroup,
                         'prefix' => $prefix,
                         'parameters' => [
+                            'scheme' => $scheme,
                             'database' => $database,
                         ]
                         + (!empty($ssl) ? ['ssl' => $ssl] : [])