diff --git a/mcs/errors/cs0120-15.cs b/mcs/errors/cs0120-15.cs
new file mode 100644
index 000000000000..6caa58756118
--- /dev/null
+++ b/mcs/errors/cs0120-15.cs
@@ -0,0 +1,23 @@
+// CS0120: An object reference is required to access non-static member `MainClass.Test'
+// Line: 20
+
+public class Test
+{
+	public void Foo ()
+	{
+	}
+}
+
+public class MainClass
+{
+	public Test Test
+	{
+		get;
+		set;
+	}
+
+	public static void Main (string[] args)
+	{
+		Test.Foo ();
+	}
+}
diff --git a/mcs/errors/cs0023-6.cs b/mcs/errors/cs1525-16.cs
similarity index 54%
rename from mcs/errors/cs0023-6.cs
rename to mcs/errors/cs1525-16.cs
index ea261add0938..ae0619b6200b 100644
--- a/mcs/errors/cs0023-6.cs
+++ b/mcs/errors/cs1525-16.cs
@@ -1,4 +1,4 @@
-// CS0023: The `.' operator cannot be applied to operand of type `void'
+// CS1525: Unexpected symbol `void'
 // Line: 8
 
 class C
@@ -7,4 +7,4 @@ public static void Main ()
 	{
 		string s = void.ToString ();
 	}
-}
\ No newline at end of file
+}