diff --git a/include/PSUSensor.hpp b/include/PSUSensor.hpp
index fd69c5a..e309aeb 100644
--- a/include/PSUSensor.hpp
+++ b/include/PSUSensor.hpp
@@ -19,7 +19,7 @@
               boost::asio::io_service& io, const std::string& sensorName,
               std::vector<thresholds::Threshold>&& thresholds,
               const std::string& sensorConfiguration,
-              std::string& sensorTypeName, unsigned int factor, double max,
+              const std::string& sensorUnits, unsigned int factor, double max,
               double min, const std::string& label, size_t tSize);
     ~PSUSensor() override;
     void setupRead(void);