diff --git a/rules-tests/Renaming/Rector/Namespace_/RenameNamespaceRector/Fixture/fixture6.php.inc b/rules-tests/Renaming/Rector/Namespace_/RenameNamespaceRector/Fixture/fixture6.php.inc
new file mode 100644
index 00000000000..954a396bc73
--- /dev/null
+++ b/rules-tests/Renaming/Rector/Namespace_/RenameNamespaceRector/Fixture/fixture6.php.inc
@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Repositories;
+
+class BlogRepository {
+}
+
+function index()
+{
+    \App\Repositories\BlogRepository::class;
+}
+
+?>
+-----
+<?php
+
+namespace App\Repositories\Example;
+
+class BlogRepository {
+}
+
+function index()
+{
+    \App\Repositories\Example\BlogRepository::class;
+}
+
+?>
diff --git a/rules-tests/Renaming/Rector/Namespace_/RenameNamespaceRector/Fixture/skip_already_changed.php.inc b/rules-tests/Renaming/Rector/Namespace_/RenameNamespaceRector/Fixture/skip_already_changed.php.inc
new file mode 100644
index 00000000000..4f51fedba75
--- /dev/null
+++ b/rules-tests/Renaming/Rector/Namespace_/RenameNamespaceRector/Fixture/skip_already_changed.php.inc
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Repositories\Example;
+
+class BlogRepository {
+}
+
+function index()
+{
+    \App\Repositories\Example\BlogRepository::class;
+}
diff --git a/rules-tests/Renaming/Rector/Namespace_/RenameNamespaceRector/config/configured_rule.php b/rules-tests/Renaming/Rector/Namespace_/RenameNamespaceRector/config/configured_rule.php
index 72dcb733fdd..7c9b7ef7c51 100644
--- a/rules-tests/Renaming/Rector/Namespace_/RenameNamespaceRector/config/configured_rule.php
+++ b/rules-tests/Renaming/Rector/Namespace_/RenameNamespaceRector/config/configured_rule.php
@@ -14,5 +14,6 @@ return static function (ContainerConfigurator $containerConfigurator): void {
             'Old\Long\AnyNamespace' => 'Short\AnyNamespace',
             'PHPUnit_Framework_' => 'PHPUnit\Framework\\',
             'Foo\Bar' => 'Foo\Tmp',
+            'App\Repositories' => 'App\Repositories\Example',
         ]);
 };
diff --git a/rules/Renaming/Rector/Namespace_/RenameNamespaceRector.php b/rules/Renaming/Rector/Namespace_/RenameNamespaceRector.php
index 0051a54da76..305e5235a8a 100644
--- a/rules/Renaming/Rector/Namespace_/RenameNamespaceRector.php
+++ b/rules/Renaming/Rector/Namespace_/RenameNamespaceRector.php
@@ -4,7 +4,6 @@ declare(strict_types=1);
 
 namespace Rector\Renaming\Rector\Namespace_;
 
-use Nette\Utils\Strings;
 use PhpParser\Node;
 use PhpParser\Node\Expr\New_;
 use PhpParser\Node\Name;
@@ -134,18 +133,19 @@ final class RenameNamespaceRector extends AbstractRector implements Configurable
 
     private function processFullyQualified(Name $name, RenamedNamespace $renamedNamespace): ?FullyQualified
     {
-        $newName = $this->isPartialNamespace($name) ? $this->resolvePartialNewName(
-            $name,
-            $renamedNamespace
-        ) : $renamedNamespace->getNameInNewNamespace();
-
-        $values = array_values($this->oldToNewNamespaces);
-        if (! isset($this->isChangedInNamespaces[$newName])) {
-            return new FullyQualified($newName);
+        if (str_starts_with($name->toString(), $renamedNamespace->getNewNamespace() . '\\')) {
+            return null;
         }
 
-        if (! in_array($newName, $values, true)) {
-            return new FullyQualified($newName);
+        $nameInNewNamespace = $renamedNamespace->getNameInNewNamespace();
+
+        $values = array_values($this->oldToNewNamespaces);
+        if (! isset($this->isChangedInNamespaces[$nameInNewNamespace])) {
+            return new FullyQualified($nameInNewNamespace);
+        }
+
+        if (! in_array($nameInNewNamespace, $values, true)) {
+            return new FullyQualified($nameInNewNamespace);
         }
 
         return null;
@@ -173,28 +173,4 @@ final class RenameNamespaceRector extends AbstractRector implements Configurable
 
         return array_key_exists($newClassName, $this->oldToNewNamespaces);
     }
-
-    private function isPartialNamespace(Name $name): bool
-    {
-        $resolvedName = $name->getAttribute(AttributeKey::RESOLVED_NAME);
-        if (! $resolvedName instanceof Name) {
-            return false;
-        }
-
-        if ($resolvedName instanceof FullyQualified) {
-            return ! $this->isName($name, $resolvedName->toString());
-        }
-
-        return false;
-    }
-
-    private function resolvePartialNewName(Name $name, RenamedNamespace $renamedNamespace): string
-    {
-        $nameInNewNamespace = $renamedNamespace->getNameInNewNamespace();
-
-        // first dummy implementation - improve
-        $cutOffFromTheLeft = Strings::length($nameInNewNamespace) - Strings::length($name->toString());
-
-        return Strings::substring($nameInNewNamespace, $cutOffFromTheLeft);
-    }
 }
diff --git a/rules/Renaming/ValueObject/RenamedNamespace.php b/rules/Renaming/ValueObject/RenamedNamespace.php
index 8a1e757b572..5f6c4249498 100644
--- a/rules/Renaming/ValueObject/RenamedNamespace.php
+++ b/rules/Renaming/ValueObject/RenamedNamespace.php
@@ -15,6 +15,15 @@ final class RenamedNamespace
 
     public function getNameInNewNamespace(): string
     {
+        if ($this->newNamespace === $this->currentName) {
+            return $this->currentName;
+        }
+
         return str_replace($this->oldNamespace, $this->newNamespace, $this->currentName);
     }
+
+    public function getNewNamespace(): string
+    {
+        return $this->newNamespace;
+    }
 }