diff --git a/dyn_gandi/main.py b/dyn_gandi/main.py
index b314977..67aadc1 100644
--- a/dyn_gandi/main.py
+++ b/dyn_gandi/main.py
@@ -101,8 +101,8 @@ def renewRecords(api: dict[str, dict[str, list[str]]], current_ip: str, log: Cal
 
 
 def parseArgv(argv: list[str]) -> dict[str, list[str]]:
-    cli_options = {}
-    buffer = None
+    cli_options: dict = {}
+    buffer: str = ''
 
     for arg in argv:
         if arg.startswith('--'):