diff --git a/scripts/dht_node.py b/scripts/dht_node.py
index 8a5e18561..2686b0e9d 100644
--- a/scripts/dht_node.py
+++ b/scripts/dht_node.py
@@ -63,7 +63,7 @@ class SimpleMetrics:
         # given everything is random, the odds of a peer having the same X prefix bits matching ours is roughly 1/(2^X)
         # we use that to estimate the network size, see issue #3463 for related papers and details
         amount = 20_000
-        with self.active_estimation_semaphore:  # this is resource intensive, limit concurrency to 1
+        async with self.active_estimation_semaphore:  # this is resource intensive, limit concurrency to 1
             peers = await self.dht_node.peer_search(self.dht_node.protocol.node_id, count=amount, max_results=amount)
         close_ids = [peer for peer in peers if peer.node_id[0] == self.dht_node.protocol.node_id[0]]
         return web.json_response(