diff --git a/model/labels_test.go b/model/labels_test.go
index 23395432..70a9128c 100644
--- a/model/labels_test.go
+++ b/model/labels_test.go
@@ -141,6 +141,11 @@ func TestLabelNameIsValid(t *testing.T) {
 			legacyValid: false,
 			utf8Valid:   false,
 		},
+		{
+			ln:          "dot.in.name",
+			legacyValid: false,
+			utf8Valid:   true,
+		},
 	}
 
 	for _, s := range scenarios {
diff --git a/model/metric_test.go b/model/metric_test.go
index 6152c548..5209a643 100644
--- a/model/metric_test.go
+++ b/model/metric_test.go
@@ -145,6 +145,11 @@ func TestMetricNameIsLegacyValid(t *testing.T) {
 			legacyValid: false,
 			utf8Valid:   false,
 		},
+		{
+			mn:          "dot.in.name",
+			legacyValid: false,
+			utf8Valid:   true,
+		},
 	}
 
 	for _, s := range scenarios {