diff --git a/data/custom.h b/data/custom.h
index c3ed08d..0338260 100644
--- a/data/custom.h
+++ b/data/custom.h
@@ -6,7 +6,7 @@ Data *custom_get(typename Data::__Self *self) {
 
 // Duplicate VTable
 template <typename T>
-T *__dup_vtable(const T *vtable) {
+T *custom_dup_vtable(const T *vtable) {
     // Get Size
     constexpr size_t rtti_size = sizeof(void *);
     const unsigned char *const real_vtable = ((const unsigned char *) vtable) - rtti_size;
@@ -87,7 +87,7 @@ protected:
         static __VTable *vtable = nullptr;
         if (!vtable) {
             // Create VTable
-            vtable = __dup_vtable(__VTable::base);
+            vtable = custom_dup_vtable(__VTable::base);
             __patch_vtable(vtable);
         }
         this->self->vtable = vtable;