diff --git a/src/external/ExternalSensor.cpp b/src/external/ExternalSensor.cpp
index 3a6a407..51a439a 100644
--- a/src/external/ExternalSensor.cpp
+++ b/src/external/ExternalSensor.cpp
@@ -10,6 +10,7 @@
 #include <sdbusplus/asio/object_server.hpp>
 
 #include <chrono>
+#include <cmath>
 #include <cstddef>
 #include <functional>
 #include <limits>
@@ -195,6 +196,11 @@
                    "VALUE", value);
     }
 
+    if (std::isfinite(value))
+    {
+        markAvailable(true);
+    }
+
     auto now = std::chrono::steady_clock::now();
 
     writeBegin(now);