diff --git a/include/pm3_cmd.h b/include/pm3_cmd.h
index b31a33b8d..af897b64c 100644
--- a/include/pm3_cmd.h
+++ b/include/pm3_cmd.h
@@ -401,7 +401,7 @@ typedef struct {
 } PACKED mful_readblock_t;
 
 typedef struct {
-    uint8_t bytelen;
+    uint16_t bytelen;
     uint16_t startidx;
 } PACKED mful_readblock_resp_t;