diff --git a/heart_rate_sensor_protocol.h b/heart_rate_sensor_protocol.h
index 0d851bc..62eb5b4 100644
--- a/heart_rate_sensor_protocol.h
+++ b/heart_rate_sensor_protocol.h
@@ -245,7 +245,7 @@ typedef struct {
   uint32_t sample_data_index;
   uint16_t leadoff_state;
   uint16_t sample_data_num;
-  int16_t  frame[];  // 上报的数据
+  int32_t  frame[];  // 上报的数据
 } m1003_heartrate_report_packet_t;
 
 typedef struct {