diff --git a/sensors/manager.cpp b/sensors/manager.cpp
index 78b7e64..84f7435 100644
--- a/sensors/manager.cpp
+++ b/sensors/manager.cpp
@@ -19,7 +19,7 @@
 
 #include "conf.hpp"
 
-void SensorManager::addSensor(std::string type, std::string name,
+void SensorManager::addSensor(const std::string& type, const std::string& name,
                               std::unique_ptr<Sensor> sensor)
 {
     _sensorMap[name] = std::move(sensor);
diff --git a/sensors/manager.hpp b/sensors/manager.hpp
index 97e20cf..f4f3651 100644
--- a/sensors/manager.hpp
+++ b/sensors/manager.hpp
@@ -37,7 +37,7 @@
     /*
      * Add a Sensor to the Manager.
      */
-    void addSensor(std::string type, std::string name,
+    void addSensor(const std::string& type, const std::string& name,
                    std::unique_ptr<Sensor> sensor);
 
     // TODO(venture): Should implement read/write by name.