diff --git a/config/v0.2.0/metric_test.go b/config/v0.2.0/metric_test.go
index cf2145be0fd..79e706a30cc 100644
--- a/config/v0.2.0/metric_test.go
+++ b/config/v0.2.0/metric_test.go
@@ -149,7 +149,7 @@ func TestReader(t *testing.T) {
 					Exporter: MetricExporter{
 						Prometheus: &Prometheus{
 							Host:              ptr("localhost"),
-							Port:              ptr(8888),
+							Port:              ptr(0),
 							WithoutScopeInfo:  ptr(true),
 							WithoutUnits:      ptr(true),
 							WithoutTypeSuffix: ptr(true),
diff --git a/config/v0.3.0/metric_test.go b/config/v0.3.0/metric_test.go
index 07defc008bb..b6c6d095fa8 100644
--- a/config/v0.3.0/metric_test.go
+++ b/config/v0.3.0/metric_test.go
@@ -150,7 +150,7 @@ func TestReader(t *testing.T) {
 					Exporter: PullMetricExporter{
 						Prometheus: &Prometheus{
 							Host:              ptr("localhost"),
-							Port:              ptr(8888),
+							Port:              ptr(0),
 							WithoutScopeInfo:  ptr(true),
 							WithoutUnits:      ptr(true),
 							WithoutTypeSuffix: ptr(true),