diff --git a/src/Prometheus/Histogram.php b/src/Prometheus/Histogram.php
index 9dbfda4..9041a3a 100644
--- a/src/Prometheus/Histogram.php
+++ b/src/Prometheus/Histogram.php
@@ -39,10 +39,8 @@ public function __construct(Adapter $adapter, $namespace, $name, $help, $labels
                 );
             }
         }
-        foreach ($labels as $label) {
-            if ($label === 'le') {
-                throw new \InvalidArgumentException("Histogram cannot have a label named 'le'.");
-            }
+        if (in_array('le', $labels, true)) {
+            throw new \InvalidArgumentException("Histogram cannot have a label named 'le'.");
         }
         $this->buckets = $buckets;
     }