diff --git a/src/Enum.php b/src/Enum.php
index 56c7a72..da8da23 100644
--- a/src/Enum.php
+++ b/src/Enum.php
@@ -184,7 +184,7 @@ public static function allLabels(): array
     public static function valueToLabel($value = null)
     {
         $map = self::columnValues(1, 0);
-        return $value == null ? $map : ($map[$value] ?? null);
+        return $value === null ? $map : ($map[$value] ?? null);
     }
 
     /**
@@ -197,7 +197,7 @@ public static function valueToLabel($value = null)
     public static function labelToValue(string $label = null)
     {
         $map = self::columnValues(0, 1);
-        return $label == null ? $map : ($map[$label] ?? null);
+        return $label === null ? $map : ($map[$label] ?? null);
     }
 
     /**