diff --git a/include/dfu.h b/include/dfu.h
index 47b9055..7779710 100644
--- a/include/dfu.h
+++ b/include/dfu.h
@@ -62,7 +62,7 @@
 #define CONFIG_SYS_DFU_DATA_BUF_SIZE		(1024*1024*8)	/* 8 MiB */
 #endif
 #ifndef CONFIG_SYS_DFU_MAX_FILE_SIZE
-#define CONFIG_SYS_DFU_MAX_FILE_SIZE	(4 << 20)	/* 4 MiB */
+#define CONFIG_SYS_DFU_MAX_FILE_SIZE CONFIG_SYS_DFU_DATA_BUF_SIZE
 #endif
 
 struct dfu_entity {