diff --git a/satellite/durability/observer.go b/satellite/durability/observer.go
index 4ed4d9157..d3f344f04 100644
--- a/satellite/durability/observer.go
+++ b/satellite/durability/observer.go
@@ -126,10 +126,16 @@ func (c *Report) Start(ctx context.Context, startTime time.Time) error {
 		return errs.Wrap(err)
 	}
 	c.aliasMap = aliasMap
+	c.resetStat()
 	c.classifyNodeAliases()
 	return nil
 }
 
+func (c *Report) resetStat() {
+	c.healthStat = make(map[string]*HealthStat)
+	c.busFactor = HealthStat{}
+}
+
 func (c *Report) classifyNodeAliases() {
 	c.classID = make(map[string]classID, len(c.classifiers))
 	c.className = make(map[classID]string, len(c.classifiers))
diff --git a/satellite/durability/observer_test.go b/satellite/durability/observer_test.go
index f0834d49e..dfa960ffb 100644
--- a/satellite/durability/observer_test.go
+++ b/satellite/durability/observer_test.go
@@ -103,6 +103,18 @@ func TestDurability(t *testing.T) {
 	require.Equal(t, segment1.StreamID.String()+"/0", c.healthStat["net:127.0.0.0"].Exemplar)
 	require.Equal(t, 2, c.healthStat["net:127.0.1.0"].Min())
 	require.Equal(t, 3, c.healthStat["net:127.0.2.0"].Min())
+
+	// usually called with c.Start()
+	c.resetStat()
+
+	fork, err = c.Fork(ctx)
+	require.NoError(t, err)
+	err = c.Join(ctx, fork)
+	require.NoError(t, err)
+
+	// second run supposed to have zero stat.
+	require.Nil(t, c.healthStat["net:127.0.0.0"])
+
 }
 
 func TestDurabilityUnknownNode(t *testing.T) {