diff --git a/src/Illuminate/Routing/ImplicitRouteBinding.php b/src/Illuminate/Routing/ImplicitRouteBinding.php
index c6d1953462a6..0114f1ac7986 100644
--- a/src/Illuminate/Routing/ImplicitRouteBinding.php
+++ b/src/Illuminate/Routing/ImplicitRouteBinding.php
@@ -36,7 +36,6 @@ public static function resolveForRoute($container, $route)
             $instance = $container->make(Reflector::getParameterClassName($parameter));
 
             $parent = $route->parentOfParameter($parameterName);
-
             if ($parent instanceof UrlRoutable && in_array($parameterName, array_keys($route->bindingFields()))) {
                 if (! $model = $parent->resolveChildRouteBinding(
                     $parameterName, $parameterValue, $route->bindingFieldFor($parameterName)
diff --git a/src/Illuminate/Routing/Route.php b/src/Illuminate/Routing/Route.php
index f67756d353a0..37ba1aaa4236 100755
--- a/src/Illuminate/Routing/Route.php
+++ b/src/Illuminate/Routing/Route.php
@@ -238,8 +238,7 @@ protected function runCallable()
      */
     protected function isSerializedClosure()
     {
-        return is_string($this->action['uses']) &&
-               Str::startsWith($this->action['uses'], 'C:32:"Opis\\Closure\\SerializableClosure') !== false;
+        return RouteAction::containsSerializedClosure($this->action);
     }
 
     /**
diff --git a/src/Illuminate/Routing/RouteAction.php b/src/Illuminate/Routing/RouteAction.php
index 9d7eb76a85d8..5a8188e27bbd 100644
--- a/src/Illuminate/Routing/RouteAction.php
+++ b/src/Illuminate/Routing/RouteAction.php
@@ -94,4 +94,16 @@ protected static function makeInvokable($action)
 
         return $action.'@__invoke';
     }
+
+    /**
+     * Determine if the given array actions contains a serialized Closure.
+     *
+     * @param  array  $action
+     * @return bool
+     */
+    public static function containsSerializedClosure(array $action)
+    {
+        return is_string($action['uses']) &&
+               Str::startsWith($action['uses'], 'C:32:"Opis\\Closure\\SerializableClosure') !== false;
+    }
 }
diff --git a/src/Illuminate/Routing/RouteSignatureParameters.php b/src/Illuminate/Routing/RouteSignatureParameters.php
index bd7e932fb316..03d3137b511c 100644
--- a/src/Illuminate/Routing/RouteSignatureParameters.php
+++ b/src/Illuminate/Routing/RouteSignatureParameters.php
@@ -18,9 +18,13 @@ class RouteSignatureParameters
      */
     public static function fromAction(array $action, $subClass = null)
     {
-        $parameters = is_string($action['uses'])
-                        ? static::fromClassMethodString($action['uses'])
-                        : (new ReflectionFunction($action['uses']))->getParameters();
+        $callback = RouteAction::containsSerializedClosure($action)
+                        ? unserialize($action['uses'])->getClosure()
+                        : $action['uses'];
+
+        $parameters = is_string($callback)
+                        ? static::fromClassMethodString($callback)
+                        : (new ReflectionFunction($callback))->getParameters();
 
         return is_null($subClass) ? $parameters : array_filter($parameters, function ($p) use ($subClass) {
             return Reflector::isParameterSubclassOf($p, $subClass);