diff --git a/src/IpmbSensor.cpp b/src/IpmbSensor.cpp
index 5658210..d821982 100644
--- a/src/IpmbSensor.cpp
+++ b/src/IpmbSensor.cpp
@@ -296,8 +296,9 @@
         {
             return; // we're being canceled
         }
-        if (!isPowerOn() && readState != PowerState::always)
+        if (!readingStateGood())
         {
+            updateValue(std::numeric_limits<double>::quiet_NaN());
             read();
             return;
         }