diff --git a/zfs-snapshot-backup.py b/zfs-snapshot-backup.py
index f3a6d77..69cc143 100644
--- a/zfs-snapshot-backup.py
+++ b/zfs-snapshot-backup.py
@@ -64,9 +64,10 @@ def list_remote_backups(members):
         try:
             backups = clean_split(remote_call(["ls", remote_sub_dir]))
             result[member] = set(backups)
-        except CalledProcessError:
+        except subprocess.CalledProcessError:
             remote_call(["mkdir", remote_sub_dir])
             result[member] = set()
+    return result
 
 
 def backup_latest_snapshot(member, elab_snapshots, existing_backups):
@@ -125,4 +126,4 @@ def create_backups():
 
 if __name__ == "__main__":
     es = elab_snapshots()
-    print(list_remote_backups(es.keys())
+    print(list_remote_backups(es.keys()))