diff --git a/squirrelbattle/mapgeneration/randomwalk.py b/squirrelbattle/mapgeneration/randomwalk.py
index b3287ea..32ec0d6 100644
--- a/squirrelbattle/mapgeneration/randomwalk.py
+++ b/squirrelbattle/mapgeneration/randomwalk.py
@@ -58,9 +58,7 @@ class Walker:
 
 
 class Generator:
-    def __init__(self, params: dict = None):
-        if params is None:
-            params = DEFAULT_PARAMS
+    def __init__(self, params: dict = DEFAULT_PARAMS):
         self.params = params
 
     def run(self) -> Map: