diff --git a/cmd/mvebu/bubt.c b/cmd/mvebu/bubt.c
index d4f381b..543eca8 100644
--- a/cmd/mvebu/bubt.c
+++ b/cmd/mvebu/bubt.c
@@ -89,7 +89,7 @@
 struct a38x_main_hdr_v1 {
 	u8  blockid;               /* 0x0       */
 	u8  flags;                 /* 0x1       */
-	u16 reserved2;             /* 0x2-0x3   */
+	u16 nandpagesize;          /* 0x2-0x3   */
 	u32 blocksize;             /* 0x4-0x7   */
 	u8  version;               /* 0x8       */
 	u8  headersz_msb;          /* 0x9       */