diff --git a/services/src/sensor_data_processer.cpp b/services/src/sensor_data_processer.cpp
index f67513209cc663c41c859e3e927860492026a60f..6ccbca20c086b82ff055ce10bef7c3ccaa810803 100644
--- a/services/src/sensor_data_processer.cpp
+++ b/services/src/sensor_data_processer.cpp
@@ -206,7 +206,7 @@ void SensorDataProcesser::SendRawData(std::unordered_map<int32_t, SensorData> &c
     if (events.empty()) {
         return;
     }
-    size_t eventSize = events.size();
+    int32_t eventSize = static_cast<int32_t>(events.size());
     auto ret = channel->SendData(events.data(), eventSize * sizeof(SensorData));
     if (ret != ERR_OK) {
         SEN_HILOGE("Send data failed, ret:%{public}d, sensorId:%{public}d, timestamp:%{public}" PRId64,