diff --git a/aleksis/core/settings.py b/aleksis/core/settings.py
index c90f64c89ce9a44d82fafb1855b34f544d7c0fb1..9c251318fe77d664215a0352cd3f24219a3971c0 100644
--- a/aleksis/core/settings.py
+++ b/aleksis/core/settings.py
@@ -203,7 +203,7 @@ if _settings.get("caching.memcached.enabled", False):
     INSTALLED_APPS.append("cachalot")
     DEBUG_TOOLBAR_PANELS.append("cachalot.panels.CachalotPanel")
     CACHALOT_TIMEOUT = _settings.get("caching.cachalot.timeout", None)
-    CACHALOT_DATABASES = set("default")
+    CACHALOT_DATABASES = set(["default"])
     SILENCED_SYSTEM_CHECKS.append("cachalot.W001")
 
 # Password validation