diff --git a/core/hw/naomi/gdcartridge.cpp b/core/hw/naomi/gdcartridge.cpp
index 81e24df27..d21090d10 100644
--- a/core/hw/naomi/gdcartridge.cpp
+++ b/core/hw/naomi/gdcartridge.cpp
@@ -11,6 +11,7 @@
  */
 
 #include "gdcartridge.h"
+#include "stdclass.h"
 
 /*