diff --git a/cmd/postgres_exporter/probe.go b/cmd/postgres_exporter/probe.go
index 6c9a46bf..28d1395e 100644
--- a/cmd/postgres_exporter/probe.go
+++ b/cmd/postgres_exporter/probe.go
@@ -114,6 +114,7 @@ func handleProbe(logger log.Logger) http.HandlerFunc {
 
 		duration := time.Since(start).Seconds()
 		probeDurationGauge.Set(duration)
+		probeSuccessGauge.Set(1)
 
 		// TODO check success, etc
 		h := promhttp.HandlerFor(registry, promhttp.HandlerOpts{})