diff --git a/src/Profiler.php b/src/Profiler.php
index f717949..ad05ac8 100644
--- a/src/Profiler.php
+++ b/src/Profiler.php
@@ -6,11 +6,6 @@
 
 /* final */class Profiler implements ProfilerInterface
 {
-    /**
-     * @var Profile<mixed>|null $parentProfile
-     */
-    protected Profile|null $parentProfile = null;
-
     public function profile(callable $callable): ProcessableProfileInterface & ProfileWithOutputInterface
     {
         $profiling = Profiling::start();
@@ -19,8 +14,6 @@ public function profile(callable $callable): ProcessableProfileInterface & Profi
         $profile = $profiling->finish();
         $profile->setOutput($output);
 
-        $this->parentProfile?->addChild($profile);
-
         return $profile; // @phpstan-ignore return.type
     }
 }
diff --git a/src/Profiling.php b/src/Profiling.php
index 590f5bb..6664ab0 100644
--- a/src/Profiling.php
+++ b/src/Profiling.php
@@ -46,18 +46,20 @@ public static function createNestedProfiler(Profiling $profiling): ProfilerInter
              * @param Profile<mixed> $parentProfile
              */
             public function __construct(
-                Profile $parentProfile,
+                private readonly Profile $parentProfile,
             ) {
-                $this->parentProfile = $parentProfile;
             }
 
             public function profile(callable $callable): ProcessableProfileInterface & ProfileWithOutputInterface
             {
-                if ($this->parentProfile?->getState() !== ProfileState::Started) {
+                if ($this->parentProfile->getState() !== ProfileState::Started) {
                     throw new Exception\ParentProfileIsNotStarted();
                 }
 
-                return parent::profile($callable);
+                $profile = parent::profile($callable);
+                $this->parentProfile->addChild($profile);
+
+                return $profile;
             }
         };
     }