diff --git a/pkg/services/ngalert/notifier/alertmanager_test.go b/pkg/services/ngalert/notifier/alertmanager_test.go
index a3b0ebece1d..5e2f10e7420 100644
--- a/pkg/services/ngalert/notifier/alertmanager_test.go
+++ b/pkg/services/ngalert/notifier/alertmanager_test.go
@@ -346,10 +346,6 @@ func TestPutAlert(t *testing.T) {
 // implement a custom maintenance function for silences, because we snapshot
 // our data differently, so we test that functionality.
 func TestSilenceCleanup(t *testing.T) {
-	// TODO: This test intermittently fails. Un-skip me!
-	// https://github.com/grafana/grafana/issues/47470
-	t.Skip("intermittent test")
-
 	require := require.New(t)
 
 	oldRetention := retentionNotificationsAndSilences
@@ -390,10 +386,10 @@ func TestSilenceCleanup(t *testing.T) {
 		makeSilence("", "tests", dt(now.Add(5*time.Hour)), dt(now.Add(6*time.Hour)), matchers),
 		// Active now
 		makeSilence("", "tests", dt(now.Add(-5*time.Hour)), dt(now.Add(6*time.Hour)), matchers),
-		// Expiring soon
-		makeSilence("", "tests", dt(now.Add(-5*time.Hour)), dt(now.Add(2*time.Second)), matchers),
+		// Expiring soon.
+		makeSilence("", "tests", dt(now.Add(-5*time.Hour)), dt(now.Add(5*time.Second)), matchers),
 		// Expiring *very* soon
-		makeSilence("", "tests", dt(now.Add(-5*time.Hour)), dt(now.Add(20*time.Millisecond)), matchers),
+		makeSilence("", "tests", dt(now.Add(-5*time.Hour)), dt(now.Add(2*time.Second)), matchers),
 	}
 
 	for _, s := range silences {
@@ -407,12 +403,12 @@ func TestSilenceCleanup(t *testing.T) {
 		found, err := am.ListSilences(nil)
 		require.NoError(err)
 		return len(found) == 3
-	}, 1500*time.Millisecond, 150*time.Millisecond)
+	}, 3*time.Second, 150*time.Millisecond)
 
 	// Wait again for another silence to expire.
 	require.Eventually(func() bool {
 		found, err := am.ListSilences(nil)
 		require.NoError(err)
 		return len(found) == 2
-	}, 2*time.Second, 150*time.Millisecond)
+	}, 6*time.Second, 150*time.Millisecond)
 }