diff --git a/src/p2pool.cpp b/src/p2pool.cpp
index 8850594..5e34ddf 100644
--- a/src/p2pool.cpp
+++ b/src/p2pool.cpp
@@ -1559,7 +1559,7 @@ void p2pool::api_update_network_stats()
 				<< "\",\"height\":" << mainnet_tip.height
 				<< ",\"reward\":" << mainnet_tip.reward
 				<< ",\"timestamp\":" << mainnet_tip.timestamp
-				<< ",\"zmq_last_active\":" << zmq_last_active()
+				<< ",\"zmq_last_active\":" << (seconds_since_epoch() - zmq_last_active())
 				<< "}";
 		});