diff --git a/include/rp6502.h b/include/rp6502.h
index 5ff7e8995..640e4b59b 100644
--- a/include/rp6502.h
+++ b/include/rp6502.h
@@ -137,6 +137,7 @@ void ria_tzset (unsigned long time);
 
 #define xreg_ria_keyboard(...) xreg(0, 0, 0, __VA_ARGS__)
 #define xreg_ria_mouse(...) xreg(0, 0, 1, __VA_ARGS__)
+#define xreg_ria_gamepad(...) xreg(0, 0, 2, __VA_ARGS__)
 #define xreg_vga_canvas(...) xreg(1, 0, 0, __VA_ARGS__)
 #define xreg_vga_mode(...) xreg(1, 0, 1, __VA_ARGS__)