diff --git a/contrib/mempool.py b/contrib/mempool.py
index f5d7486..0cf57b8 100755
--- a/contrib/mempool.py
+++ b/contrib/mempool.py
@@ -21,7 +21,7 @@ def main():
     txids = list(map(lambda a: [a], txids))
 
     entries = d.request('getmempoolentry', txids)
-    entries = [{'fee': e['fee']*1e8, 'vsize': e['vsize']} for e in entries]
+    entries = [{'fee': e['fees']['base']*1e8, 'vsize': e['vsize']} for e in entries]
     for e in entries:
         e['rate'] = e['fee'] / e['vsize']  # sat/vbyte
     entries.sort(key=lambda e: e['rate'], reverse=True)