diff --git a/src/common/host_memory.h b/src/common/host_memory.h
index 31af3cc9f1..f26804b55b 100644
--- a/src/common/host_memory.h
+++ b/src/common/host_memory.h
@@ -83,6 +83,9 @@ private:
     u8* backing_base{};
     u8* virtual_base{};
     size_t virtual_base_offset{};
+#ifdef __OPENORBIS__
+    std::optional<Common::VirtualBuffer<u8>> fallback_buffer;
+#endif
 };
 
 } // namespace Common