diff --git a/src/SensorPaths.hpp b/src/SensorPaths.hpp
index e2475fa..8524400 100644
--- a/src/SensorPaths.hpp
+++ b/src/SensorPaths.hpp
@@ -27,6 +27,8 @@
 constexpr const char* unitCFM = "xyz.openbmc_project.Sensor.Value.Unit.CFM";
 constexpr const char* unitPascals =
     "xyz.openbmc_project.Sensor.Value.Unit.Pascals";
+constexpr const char* unitPercentRH =
+    "xyz.openbmc_project.Sensor.Value.Unit.PercentRH";
 
 std::string getPathForUnits(const std::string& units);