diff --git a/src/Monitoring/Metric/AbstractMetric.php b/src/Monitoring/Metric/AbstractMetric.php
index ca6531d..edcfbb4 100644
--- a/src/Monitoring/Metric/AbstractMetric.php
+++ b/src/Monitoring/Metric/AbstractMetric.php
@@ -16,7 +16,7 @@ abstract class AbstractMetric implements AttributeInterface
     public function getState(): MetricStateEnum
     {
         if ($this->state === null) {
-            throw new \RuntimeException(__CLASS__.'::$state is not set.');
+            throw new \RuntimeException(static::class.'::$state is not set.');
         }
 
         return $this->state;