diff --git a/board/AndesTech/ax25-ae350/ax25-ae350.c b/board/AndesTech/ax25-ae350/ax25-ae350.c
index 36f0dd4b0f..63a966e092 100644
--- a/board/AndesTech/ax25-ae350/ax25-ae350.c
+++ b/board/AndesTech/ax25-ae350/ax25-ae350.c
@@ -60,7 +60,7 @@ void *board_fdt_blob_setup(int *err)
 	*err = 0;
 
 	if (IS_ENABLED(CONFIG_OF_SEPARATE) || IS_ENABLED(CONFIG_OF_BOARD)) {
-		if (gd->arch.firmware_fdt_addr)
+		if (fdt_magic((uintptr_t)gd->arch.firmware_fdt_addr) == FDT_MAGIC)
 			return (void *)(ulong)gd->arch.firmware_fdt_addr;
 	}