diff --git a/src/Symfony/Component/Config/FileLocator.php b/src/Symfony/Component/Config/FileLocator.php
index 486c002afa4a6..99c35bd265430 100644
--- a/src/Symfony/Component/Config/FileLocator.php
+++ b/src/Symfony/Component/Config/FileLocator.php
@@ -31,7 +31,9 @@ public function __construct(string|array $paths = [])
     }
 
     /**
-     * @return string|array
+     * @return string|string[]
+     *
+     * @psalm-return ($first is true ? string : string[])
      */
     public function locate(string $name, ?string $currentPath = null, bool $first = true)
     {
diff --git a/src/Symfony/Component/Config/FileLocatorInterface.php b/src/Symfony/Component/Config/FileLocatorInterface.php
index 97b5ff39357ba..755cf018af2b9 100644
--- a/src/Symfony/Component/Config/FileLocatorInterface.php
+++ b/src/Symfony/Component/Config/FileLocatorInterface.php
@@ -25,10 +25,12 @@ interface FileLocatorInterface
      * @param string|null $currentPath The current path
      * @param bool        $first       Whether to return the first occurrence or an array of filenames
      *
-     * @return string|array The full path to the file or an array of file paths
+     * @return string|string[] The full path to the file or an array of file paths
      *
      * @throws \InvalidArgumentException        If $name is empty
      * @throws FileLocatorFileNotFoundException If a file is not found
+     *
+     * @psalm-return ($first is true ? string : string[])
      */
     public function locate(string $name, ?string $currentPath = null, bool $first = true);
 }