diff --git a/_demo/cppintf/cppintf.go b/_demo/cppintf/cppintf.go
index 9d2475c8..634f9949 100644
--- a/_demo/cppintf/cppintf.go
+++ b/_demo/cppintf/cppintf.go
@@ -34,4 +34,5 @@ func (p *Bar) sqrt(v float64) float64 {
 func main() {
 	bar := NewBar(1)
 	foo.F(&bar.Callback)
+	foo.G(&bar.Callback)
 }
diff --git a/_demo/cppintf/foo/bar/bar.cpp b/_demo/cppintf/foo/bar/bar.cpp
index f6a8fa5f..5e226c26 100644
--- a/_demo/cppintf/foo/bar/bar.cpp
+++ b/_demo/cppintf/foo/bar/bar.cpp
@@ -9,3 +9,7 @@ interface ICallback {
 extern "C" void f(ICallback* cb) {
 	printf("val: %d\ncalc(2): %lf\n", cb->val(), cb->calc(2));
 }
+
+void g(ICallback* cb) {
+	f(cb);
+}
diff --git a/_demo/cppintf/foo/foo.go b/_demo/cppintf/foo/foo.go
index eeeb2349..ebd047ef 100644
--- a/_demo/cppintf/foo/foo.go
+++ b/_demo/cppintf/foo/foo.go
@@ -20,3 +20,6 @@ type CallbackVtbl struct {
 
 //go:linkname F C.f
 func F(cb *Callback)
+
+//go:linkname G C._Z1gP9ICallback
+func G(cb *Callback)