diff --git a/pid/fancontroller.cpp b/pid/fancontroller.cpp
index 41f24da..d3c58ca 100644
--- a/pid/fancontroller.cpp
+++ b/pid/fancontroller.cpp
@@ -21,6 +21,7 @@
 #include "zone.hpp"
 
 #include <algorithm>
+#include <cmath>
 #include <iostream>
 
 namespace pid_control
@@ -62,10 +63,16 @@
              * sort of have to guess -- all the other fans are reporting, why
              * not this one?  Maybe it's unable to be read, so it's "bad."
              */
-            if (value > 0)
+            if (!(std::isfinite(value)))
             {
-                values.push_back(value);
+                continue;
             }
+            if (value <= 0)
+            {
+                continue;
+            }
+
+            values.push_back(value);
         }
     }
     catch (const std::exception& e)