diff --git a/pynetbox/core/response.py b/pynetbox/core/response.py
index b1a517c2..67fb2c6e 100644
--- a/pynetbox/core/response.py
+++ b/pynetbox/core/response.py
@@ -330,7 +330,7 @@ def fmt_dict(k, v):
             if isinstance(v, dict):
                 return k, Hashabledict(v)
             if isinstance(v, list):
-                return k, "".join(map(str, v))
+                return k, ",".join(map(str, v))
             return k, v
 
         current = Hashabledict(