diff --git a/buffer.go b/buffer.go
index eadfde0..88bafa6 100644
--- a/buffer.go
+++ b/buffer.go
@@ -71,6 +71,7 @@ func (b *Buffer) Free() {
 		panic("cgo.Buffer.Free: double-free detected")
 	}
 
+	runtime.SetFinalizer(b, nil)
 	C.free(b.pointer)
 	b.pointer = nil
 	b.data = nil
diff --git a/scope.go b/scope.go
index 147deb9..2a9bbc9 100644
--- a/scope.go
+++ b/scope.go
@@ -81,6 +81,7 @@ func (s *Scope) FreeAll() {
 	if !s.freed.CompareAndSwap(false, true) {
 		panic("cgo.Scope.FreeAll: double-free detected")
 	}
+	runtime.SetFinalizer(s, nil)
 
 	s.lock.Lock()
 	buffers := s.buffers