diff --git a/modules/mesh-self-check/cmd/mesh-self-check/probes_test.go b/modules/mesh-self-check/cmd/mesh-self-check/probes_test.go
index 6b76380b..7c3a9de8 100644
--- a/modules/mesh-self-check/cmd/mesh-self-check/probes_test.go
+++ b/modules/mesh-self-check/cmd/mesh-self-check/probes_test.go
@@ -257,7 +257,7 @@ func machines() *memStore {
 // filling is a store holding the self-check's written fill finding of a stream: the condition open.
 func filling(stream string) *memStore {
 	s := newStore()
-	o := Observation{Kind: "bucket-or-log-filling", Token: "filling", Subject: Subject{Scope: ScopeBus, ID: stream},
+	o := Observation{Kind: "bucket-or-log-filling", Token: "filling", Severity: Warning, Subject: Subject{Scope: ScopeBus, ID: stream},
 		Summary: "filling", Source: "D-fill"}
 	raw, _ := health.EncodeFinding(o.Finding("run", time.Now()))
 	_ = s.Put(FindingsState, o.Key(), json.RawMessage(raw))