diff --git a/src/cfiflash.h b/src/cfiflash.h
index 5150d5b..ba4a020 100644
--- a/src/cfiflash.h
+++ b/src/cfiflash.h
@@ -13,7 +13,9 @@
 #define	SR_BIT_ISMS			0x00800080
 
 #define CFI_IS_ERROR(e)		((e & CFI_ERR_BASE) == CFI_ERR_BASE)
-#define	CFI_ERR_BASE		(0x80000000 + 0x00100000)
+#ifndef CFI_ERR_BASE
+#define	CFI_ERR_BASE		(0x80000000)
+#endif
 #define	CFI_ERR_GENERAL		(CFI_ERR_BASE + 0)
 #define	CFI_ERR_NOTFOUND	(CFI_ERR_BASE + 1)
 #define	CFI_ERR_INVPARAM	(CFI_ERR_BASE + 2)