diff --git a/frameworks/native/qos_ndk.cpp b/frameworks/native/qos_ndk.cpp
index 46b0abc40fafee0a57c5e611e82c402744b6cd96..cb04b2fcaacc609cf1f87c44d2430604a7bd6a6d 100644
--- a/frameworks/native/qos_ndk.cpp
+++ b/frameworks/native/qos_ndk.cpp
@@ -23,6 +23,7 @@ static constexpr int ERROR_NUM = -1;
 using namespace OHOS::QOS;
 using namespace std;
 
+namespace {
 const unordered_map<QoS_Level, QosLevel> qos_map = {
     {QoS_Level::QOS_BACKGROUND, QosLevel::QOS_BACKGROUND},
     {QoS_Level::QOS_UTILITY, QosLevel::QOS_UTILITY},
@@ -42,7 +43,7 @@ const unordered_map<QosLevel, QoS_Level> qos_reverse_map = {
 };
 
 
-int OH_QoS_SetThreadQoS(QoS_Level level)
+[[maybe_unused]] int OH_QoS_SetThreadQoS(QoS_Level level)
 {
     auto iter = qos_map.find(level);
     if (iter == qos_map.end()) {
@@ -51,12 +52,12 @@ int OH_QoS_SetThreadQoS(QoS_Level level)
     return QosController::GetInstance().SetThreadQosForOtherThread(iter->second, gettid());
 }
 
-int OH_QoS_ResetThreadQoS(void)
+[[maybe_unused]] int OH_QoS_ResetThreadQoS(void)
 {
     return QosController::GetInstance().ResetThreadQosForOtherThread(gettid());
 }
 
-int OH_QoS_GetThreadQoS(QoS_Level *level)
+[[maybe_unused]] int OH_QoS_GetThreadQoS(QoS_Level *level)
 {
     if (level == nullptr) {
         return ERROR_NUM;
@@ -72,4 +73,5 @@ int OH_QoS_GetThreadQoS(QoS_Level *level)
     }
     *level = iter->second;
     return 0;
-}
\ No newline at end of file
+}
+} // namespace
\ No newline at end of file
diff --git a/interfaces/kits/c/qos.h b/interfaces/kits/c/qos.h
index c92ab5b8622578b0b086fb042b15bda961c48c97..61887dd59bcd6ef9e0ecf33f4728df6927c10411 100644
--- a/interfaces/kits/c/qos.h
+++ b/interfaces/kits/c/qos.h
@@ -96,7 +96,7 @@ int OH_QoS_SetThreadQoS(QoS_Level level);
  * @see QoS_Level
  * @since 12
  */
-int OH_QoS_ResetThreadQoS();
+int OH_QoS_ResetThreadQoS(void);
 
 /**
  * @brief Obtains the QoS level of the current thread.