diff --git a/mupen64plus-core/src/device/cart/cart_rom.c b/mupen64plus-core/src/device/cart/cart_rom.c
index 86657df1f..64233b754 100644
--- a/mupen64plus-core/src/device/cart/cart_rom.c
+++ b/mupen64plus-core/src/device/cart/cart_rom.c
@@ -32,7 +32,7 @@
 #define __STDC_FORMAT_MACROS
 #include <inttypes.h>
 
-#define CART_ROM_ADDR_MASK UINT32_C(0x03ffffff);
+#define CART_ROM_ADDR_MASK UINT32_C(0x0fffffff);
 
 
 void init_cart_rom(struct cart_rom* cart_rom,