diff --git a/pirrtools/__init__.py b/pirrtools/__init__.py
index abf8d1c..ef74a08 100644
--- a/pirrtools/__init__.py
+++ b/pirrtools/__init__.py
@@ -129,7 +129,7 @@ def get_base_package(module):
     Returns:
         str: The base package of the module.
     """
-    return module.__name__.split(".", maxsplits=1)[0]
+    return module.__name__.split(".", maxsplit=1)[0]
 
 
 def find_instances(cls, module):