diff --git a/internal/e2e/metric_stability_test.go b/internal/e2e/metric_stability_test.go
index e6b884c0a848..8cbf46e9a89a 100644
--- a/internal/e2e/metric_stability_test.go
+++ b/internal/e2e/metric_stability_test.go
@@ -16,6 +16,7 @@ import (
 	"time"
 
 	"github.com/prometheus/common/expfmt"
+	"github.com/prometheus/common/model"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
@@ -51,7 +52,7 @@ func assertMetrics(t *testing.T, metricsAddr string, expectedMetrics map[string]
 	defer resp.Body.Close()
 
 	reader := bufio.NewReader(resp.Body)
-	var parser expfmt.TextParser
+	parser := expfmt.NewTextParser(model.UTF8Validation)
 	parsed, err := parser.TextToMetricFamilies(reader)
 	if err != nil {
 		return false
diff --git a/service/service_test.go b/service/service_test.go
index 8d0000db75e1..4e74ebfd541b 100644
--- a/service/service_test.go
+++ b/service/service_test.go
@@ -16,6 +16,7 @@ import (
 	"time"
 
 	"github.com/prometheus/common/expfmt"
+	"github.com/prometheus/common/model"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	config "go.opentelemetry.io/contrib/otelconf/v0.3.0"
@@ -699,7 +700,7 @@ func assertMetrics(t *testing.T, metricsAddr string, expectedLabels map[string]l
 	})
 	reader := bufio.NewReader(resp.Body)
 
-	var parser expfmt.TextParser
+	parser := expfmt.NewTextParser(model.UTF8Validation)
 	parsed, err := parser.TextToMetricFamilies(reader)
 	require.NoError(t, err)
 
diff --git a/service/telemetry/otelconftelemetry/metrics_test.go b/service/telemetry/otelconftelemetry/metrics_test.go
index 55ba81ee40d5..1712c455f6f7 100644
--- a/service/telemetry/otelconftelemetry/metrics_test.go
+++ b/service/telemetry/otelconftelemetry/metrics_test.go
@@ -12,6 +12,7 @@ import (
 
 	io_prometheus_client "github.com/prometheus/client_model/go"
 	"github.com/prometheus/common/expfmt"
+	"github.com/prometheus/common/model"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	config "go.opentelemetry.io/contrib/otelconf/v0.3.0"
@@ -183,7 +184,7 @@ func getMetricsFromPrometheus(t *testing.T, endpoint string) map[string]*io_prom
 	require.Equal(t, http.StatusOK, rr.StatusCode, "unexpected status code after %d attempts", maxRetries)
 	defer rr.Body.Close()
 
-	var parser expfmt.TextParser
+	parser := expfmt.NewTextParser(model.UTF8Validation)
 	parsed, err := parser.TextToMetricFamilies(rr.Body)
 	require.NoError(t, err)