diff --git a/mfgtool/oem_tool/hw3/oem_tool_hw.c b/mfgtool/oem_tool/hw3/oem_tool_hw.c
index 8d5039e..57dbb12 100644
--- a/mfgtool/oem_tool/hw3/oem_tool_hw.c
+++ b/mfgtool/oem_tool/hw3/oem_tool_hw.c
@@ -93,7 +93,7 @@ typedef struct _current_rc_info_t {
 } current_rc_info_t;
 
 typedef struct _diff_data_buffer_t {
-    uint8_t buf[4096];
+    uint8_t buf[OEM_INFO_MAX_SIZE];
     uint16_t len_total;
     uint16_t len_cut;
     uint16_t last_offset;