diff --git a/usr/lib/python3.6/lxcmgr/pkgmgr.py b/usr/lib/python3.6/lxcmgr/pkgmgr.py
index af8bc4c..47d59ba 100644
--- a/usr/lib/python3.6/lxcmgr/pkgmgr.py
+++ b/usr/lib/python3.6/lxcmgr/pkgmgr.py
@@ -245,7 +245,7 @@ class PkgMgr:
 
     def purge_unused_layers(self):
         # Remove layers which are no longer used by any installed application
-        layers = set(os.list(LXC_STORAGE_DIR))
+        layers = set(os.listdir(LXC_STORAGE_DIR))
         for app in self.installed_packages['apps']:
             for container in self.installed_packages['apps'][app]['containers']:
                 image = self.installed_packages['apps'][app]['containers'][container]['image']