diff --git a/include/TachSensor.hpp b/include/TachSensor.hpp
index 8dd1b88..75dcd06 100644
--- a/include/TachSensor.hpp
+++ b/include/TachSensor.hpp
@@ -69,7 +69,7 @@
                boost::asio::io_service& io, const std::string& fanName,
                std::vector<thresholds::Threshold>&& thresholds,
                const std::string& sensorConfiguration,
-               const std::pair<size_t, size_t>& limits,
+               const std::pair<double, double>& limits,
                const PowerState& powerState,
                const std::optional<std::string>& led);
     ~TachSensor() override;
diff --git a/src/FanMain.cpp b/src/FanMain.cpp
index a32d054..112848b 100644
--- a/src/FanMain.cpp
+++ b/src/FanMain.cpp
@@ -369,7 +369,7 @@
 
                 constexpr double defaultMaxReading = 25000;
                 constexpr double defaultMinReading = 0;
-                auto limits =
+                std::pair<double, double> limits =
                     std::make_pair(defaultMinReading, defaultMaxReading);
 
                 auto connector =
diff --git a/src/TachSensor.cpp b/src/TachSensor.cpp
index 4ba7777..09194f2 100644
--- a/src/TachSensor.cpp
+++ b/src/TachSensor.cpp
@@ -46,7 +46,7 @@
                        boost::asio::io_service& io, const std::string& fanName,
                        std::vector<thresholds::Threshold>&& thresholdsIn,
                        const std::string& sensorConfiguration,
-                       const std::pair<size_t, size_t>& limits,
+                       const std::pair<double, double>& limits,
                        const PowerState& powerState,
                        const std::optional<std::string>& ledIn) :
     Sensor(escapeName(fanName), std::move(thresholdsIn), sensorConfiguration,