diff --git a/lib/CPUs/MIPS/bsp/examples/bootloader/libsys_boot.h b/lib/CPUs/MIPS/bsp/examples/bootloader/libsys_boot.h
index 241103b..c075658 100644
--- a/lib/CPUs/MIPS/bsp/examples/bootloader/libsys_boot.h
+++ b/lib/CPUs/MIPS/bsp/examples/bootloader/libsys_boot.h
@@ -15,6 +15,7 @@
 #define FLOAT32 float
 #define FLOAT64 double
 
+#define	IS_ERROR(e)		((e & 0x80000000) == 0x80000000)
 
 #define	sys_gpio0		0xA0000000
 #define	sys_gpio1		0xA0000004