diff --git a/src/Generator/AST/VTables.cs b/src/Generator/AST/VTables.cs
index f910724f..e4b560f2 100644
--- a/src/Generator/AST/VTables.cs
+++ b/src/Generator/AST/VTables.cs
@@ -19,7 +19,7 @@ namespace CppSharp.AST
             throw new NotSupportedException();
         }
 
-        public static List<VTableComponent> GatherVTableMethodEntries(VTableLayout layout)
+        private static List<VTableComponent> GatherVTableMethodEntries(VTableLayout layout)
         {
             var entries = new List<VTableComponent>();
             if (layout == null)
@@ -50,11 +50,6 @@ namespace CppSharp.AST
             return GatherVTableMethodEntries(@class.Layout.Layout);
         }
 
-        public static int GetVTableComponentIndex(VTableLayout layout, VTableComponent entry)
-        {
-            return layout.Components.IndexOf(entry);
-        }
-
         public static int GetVTableComponentIndex(Class @class, VTableComponent entry)
         {
             switch (@class.Layout.ABI)
@@ -62,13 +57,14 @@ namespace CppSharp.AST
             case CppAbi.Microsoft:
                 foreach (var vfptr in @class.Layout.VFTables)
                 {
-                    var index = GetVTableComponentIndex(vfptr.Layout, entry);
+                    var index = vfptr.Layout.Components.IndexOf(entry);
                     if (index >= 0)
                         return index;
                 }
                 break;
             case CppAbi.Itanium:
-                return GetVTableComponentIndex(@class.Layout.Layout, entry);
+                // ignore offset to top and RTTI
+                return @class.Layout.Layout.Components.IndexOf(entry) - 2;
             }
 
             throw new NotSupportedException();
diff --git a/tests/VTables/VTables.Tests.cs b/tests/VTables/VTables.Tests.cs
index 29018329..de91f18c 100644
--- a/tests/VTables/VTables.Tests.cs
+++ b/tests/VTables/VTables.Tests.cs
@@ -19,8 +19,9 @@ public class VTablesTests : GeneratorTestFixture
     {
         var foo = new Foo();
         Assert.That(foo.vfoo(), Is.EqualTo(5));
-        Assert.That(foo.Vbar(), Is.EqualTo(3));
+        Assert.That(foo.Vbar(), Is.EqualTo(5));
         Assert.That(foo.CallFoo(), Is.EqualTo(7));
+        Assert.That(foo.CallVirtualWithParameter(6514), Is.EqualTo(6514 + 1));
 
         var foo2 = new FooDerived();
         Assert.That(foo2.CallFoo(), Is.EqualTo(12));
diff --git a/tests/VTables/VTables.cpp b/tests/VTables/VTables.cpp
index 249d3bd1..d80d7e88 100644
--- a/tests/VTables/VTables.cpp
+++ b/tests/VTables/VTables.cpp
@@ -11,7 +11,7 @@ int Foo::vfoo()
 
 int Foo::vbar()
 {
-    return 3;
+    return vfoo();
 }
 
 int Foo::append()
@@ -24,7 +24,12 @@ int Foo::append(int a)
     return ++a;
 }
 
+int Foo::callVirtualWithParameter(int a)
+{
+    return append(a);
+}
+
 int FooCallFoo(Foo* foo)
 {
     return foo->vfoo() + 2;
-}
\ No newline at end of file
+}
diff --git a/tests/VTables/VTables.h b/tests/VTables/VTables.h
index b72fe452..dae69f35 100644
--- a/tests/VTables/VTables.h
+++ b/tests/VTables/VTables.h
@@ -18,7 +18,7 @@ public:
 
     virtual int append();
     virtual int append(int a);
-    void callVirtualWithParameter(int a);
+    int callVirtualWithParameter(int a);
 };
 
 DLL_API int FooCallFoo(Foo* foo);