diff --git a/src/TachSensor.cpp b/src/TachSensor.cpp
index ba3b0a1..acfe659 100644
--- a/src/TachSensor.cpp
+++ b/src/TachSensor.cpp
@@ -149,9 +149,9 @@
             try
             {
                 std::getline(responseStream, response);
-                double nvalue = std::stod(response);
+                rawValue = std::stod(response);
                 responseStream.clear();
-                updateValue(nvalue);
+                updateValue(rawValue);
             }
             catch (const std::invalid_argument&)
             {