diff --git a/validator.go b/validator.go
index 27e88ca..9960189 100644
--- a/validator.go
+++ b/validator.go
@@ -81,4 +81,4 @@ func validateIdent(s string) error {
 	return nil
 }
 
-var identRegexp = regexp.MustCompile("^[a-zA-Z_:][a-zA-Z0-9_:]*$")
+var identRegexp = regexp.MustCompile("^[a-zA-Z_:.][a-zA-Z0-9_:.]*$")
diff --git a/validator_test.go b/validator_test.go
index d90b62d..8a5d734 100644
--- a/validator_test.go
+++ b/validator_test.go
@@ -18,6 +18,7 @@ func TestValidateMetricSuccess(t *testing.T) {
 	f(`foo{bar="baz", x="y\"z"}`)
 	f(`foo{bar="b}az"}`)
 	f(`:foo:bar{bar="a",baz="b"}`)
+	f(`some.foo{bar="baz"}`)
 }
 
 func TestValidateMetricError(t *testing.T) {