diff --git a/pkg/linter/lib/src/rules/unreachable_from_main.dart b/pkg/linter/lib/src/rules/unreachable_from_main.dart
index 5ba6e90fe5b..28e01013229 100644
--- a/pkg/linter/lib/src/rules/unreachable_from_main.dart
+++ b/pkg/linter/lib/src/rules/unreachable_from_main.dart
@@ -705,8 +705,11 @@ extension on Declaration {
         return self.namePart.typeName.lexeme;
       case ConstructorDeclaration():
         var name = self.name?.lexeme ?? 'new';
-        // TODO(scheglov): support primary constructors
-        return '${self.typeName!.name}.$name';
+        var typeName =
+            self.typeName ??
+            self.declaredFragment?.element.enclosingElement.name ??
+            'unknown';
+        return '$typeName.$name';
       case EnumConstantDeclaration():
         return self.name.lexeme;
       case EnumDeclaration():
diff --git a/pkg/linter/test/rules/unreachable_from_main_test.dart b/pkg/linter/test/rules/unreachable_from_main_test.dart
index 0ba8973619b..5037fb0850f 100644
--- a/pkg/linter/test/rules/unreachable_from_main_test.dart
+++ b/pkg/linter/test/rules/unreachable_from_main_test.dart
@@ -624,6 +624,19 @@ void main() {}
     ]);
   }
 
+  test_constructor_named_new() async {
+    // https://github.com/dart-lang/sdk/issues/63425
+    await assertDiagnosticsFromMarkdown(r'''
+void main() {
+  C;
+}
+
+class C {
+  new [!named!]();
+}
+''');
+  }
+
   test_constructor_named_onEnum() async {
     await assertNoDiagnostics(r'''
 void main() {