1 files changed, 1 insertions, 1 deletions
diff --git a/extras/prot_filter.py b/extras/prot_filter.py
index bc61c097faf..099832fc08a 100755
--- a/extras/prot_filter.py
+++ b/extras/prot_filter.py
@@ -126,7 +126,7 @@ if __name__ == "__main__":
         volume_list.append(extra)
     graph, last = load(path)
     for v in volume_list:
-        if graph.has_key(v):
+        if v in graph:
             break
     else:
         print("No configured volumes found - aborting.")