diff --git a/include/pm3_cmd.h b/include/pm3_cmd.h
index e3935726f..c18be6ca9 100644
--- a/include/pm3_cmd.h
+++ b/include/pm3_cmd.h
@@ -421,7 +421,7 @@ typedef struct {
 
 typedef struct {
     uint16_t bytelen;
-    uint16_t startidx;
+    uint32_t startidx;
 } PACKED mful_readblock_resp_t;
 
 typedef struct {