diff --git a/components/water_cooling_temperature_control_module/water_cooling_temperature_control_module.cpp b/components/water_cooling_temperature_control_module/water_cooling_temperature_control_module.cpp
index cdaaa6b..1e93208 100644
--- a/components/water_cooling_temperature_control_module/water_cooling_temperature_control_module.cpp
+++ b/components/water_cooling_temperature_control_module/water_cooling_temperature_control_module.cpp
@@ -14,6 +14,14 @@ using namespace iflytop;
 #define ACTION_TEST_ENABLE_LOG              5
 #define ACTION_TEST_DISABLE_LOG             6
 
+static int32_t prvabs(int32_t v){
+  if(v<0){
+    return -v;
+  }else{
+    return v;
+  }
+}
+
 void WaterCoolingTemperatureControlModule::initialize(int32_t id, config_t* cfg, hardwared_config_t* hardwaredconfig) {
   m_id               = id;
   m_hardwared_config = *hardwaredconfig;
@@ -197,7 +205,7 @@ void WaterCoolingTemperatureControlModule::workloop() {
     peltier_set_power_level(out);
     i++;
     if (i % 10 == 0) {
-      int32_t fanspeed = abs(out) * 2;
+      int32_t fanspeed = prvabs(out) * 2;
       if (fanspeed > 100) fanspeed = 100;
       if (fanspeed < m_cfg.min_fanlevel) fanspeed = m_cfg.min_fanlevel;
       fan_start(fanspeed);