diff --git a/src/GraphQLParser.Tests/Issue127.cs b/src/GraphQLParser.Tests/Issue127.cs
new file mode 100644
index 00000000..1c9ab01f
--- /dev/null
+++ b/src/GraphQLParser.Tests/Issue127.cs
@@ -0,0 +1,30 @@
+using GraphQLParser.AST;
+using Shouldly;
+using Xunit;
+
+namespace GraphQLParser.Tests;
+
+// https://github.com/graphql-dotnet/parser/issues/127
+// https://github.com/graphql/graphql-spec/pull/598
+public class Issue127
+{
+    [Theory]
+    [InlineData(IgnoreOptions.None)]
+    [InlineData(IgnoreOptions.Comments)]
+    [InlineData(IgnoreOptions.Locations)]
+    [InlineData(IgnoreOptions.All)]
+    public void Should_Parse_Single_Interface(IgnoreOptions options)
+    {
+        // https://github.com/graphql/graphql-spec/pull/598#issuecomment-815439917
+        string query = @"interface Foo
+
+{ alpha: beta }";
+        using var document = query.Parse(new ParserOptions { Ignore = options });
+        document.ShouldNotBeNull();
+        document.Definitions.Count.ShouldBe(1);
+        var def = document.Definitions[0].ShouldBeAssignableTo<GraphQLInterfaceTypeDefinition>();
+        def.Fields.Count.ShouldBe(1);
+        def.Fields[0].Name.Value.ShouldBe("alpha");
+        def.Fields[0].Type.ShouldBeAssignableTo<GraphQLNamedType>().Name.Value.ShouldBe("beta");
+    }
+}