diff --git a/src/Illuminate/Validation/Concerns/ValidatesAttributes.php b/src/Illuminate/Validation/Concerns/ValidatesAttributes.php
index ce0ce658072c..312c0b71e34c 100644
--- a/src/Illuminate/Validation/Concerns/ValidatesAttributes.php
+++ b/src/Illuminate/Validation/Concerns/ValidatesAttributes.php
@@ -1438,6 +1438,10 @@ public function validateJson($attribute, $value)
             return false;
         }
 
+        if (function_exists('json_validate')) {
+            return json_validate($value);
+        }
+
         json_decode($value);
 
         return json_last_error() === JSON_ERROR_NONE;