diff --git a/internal/metrics/metrics.go b/internal/metrics/metrics.go
index bc9bc6b..d0cf10c 100644
--- a/internal/metrics/metrics.go
+++ b/internal/metrics/metrics.go
@@ -251,6 +251,7 @@ func NewPrometheusReporter(reg prometheus.Registerer, logger Logger) (*Prometheu
 		r.tcpChecker.open,
 		r.tcpChecker.connectedTotal,
 		r.tcpChecker.disconectedTotal,
+		r.tcpChecker.checks,
 		r.ikeSA.establishedSeconds,
 		r.ikeSA.packetsIn,
 		r.ikeSA.packetsOut,