diff --git a/gunicorn/glogging.py b/gunicorn/glogging.py
index 6d80a3ac..fec25a10 100644
--- a/gunicorn/glogging.py
+++ b/gunicorn/glogging.py
@@ -90,7 +90,7 @@ CONFIG_DEFAULTS = dict(
 def loggers():
     """ get list of all loggers """
     root = logging.root
-    existing = root.manager.loggerDict.keys()
+    existing = list(root.manager.loggerDict.keys())
     return [logging.getLogger(name) for name in existing]