diff --git a/src/python/jw/pkg/lib/Distro.py b/src/python/jw/pkg/lib/Distro.py
index 10b6d5e7..f041a8af 100644
--- a/src/python/jw/pkg/lib/Distro.py
+++ b/src/python/jw/pkg/lib/Distro.py
@@ -205,7 +205,7 @@ class Distro(abc.ABC):
 
     @cached_property
     def pkg_ext(self) -> str:
-        for entry in self.os_cascade():
+        for entry in self.os_cascade:
             ret = entry.replace('pkg-', '')
             if ret != entry:
                 return ret