diff --git a/src/Illuminate/Foundation/Providers/FoundationServiceProvider.php b/src/Illuminate/Foundation/Providers/FoundationServiceProvider.php
index 9b5c6799d9a3..fe384e757d0f 100644
--- a/src/Illuminate/Foundation/Providers/FoundationServiceProvider.php
+++ b/src/Illuminate/Foundation/Providers/FoundationServiceProvider.php
@@ -2,6 +2,7 @@
 
 namespace Illuminate\Foundation\Providers;
 
+use Illuminate\Support\Str;
 use Illuminate\Http\Request;
 use Illuminate\Support\AggregateServiceProvider;
 
@@ -39,7 +40,7 @@ public function registerRequestValidate()
             validator()->validate($this->all(), $rules, ...$params);
 
             return $this->only(collect($rules)->keys()->map(function ($rule) {
-                return str_contains($rule, '.') ? explode('.', $rule)[0] : $rule;
+                return Str::contains($rule, '.') ? explode('.', $rule)[0] : $rule;
             })->unique()->toArray());
         });
     }