diff --git a/manager-bundle/src/Command/InstallWebDirCommand.php b/manager-bundle/src/Command/InstallWebDirCommand.php
index 70669efe490..088c8847ef2 100644
--- a/manager-bundle/src/Command/InstallWebDirCommand.php
+++ b/manager-bundle/src/Command/InstallWebDirCommand.php
@@ -113,6 +113,7 @@ protected function executeLocked(InputInterface $input, OutputInterface $output)
 
         $webDir = $this->rootDir.'/'.rtrim($input->getArgument('target'), '/');
 
+        $this->addHtaccess($webDir);
         $this->addFiles($webDir, !$input->getOption('no-dev'));
         $this->removeInstallPhp($webDir);
         $this->storeAppDevAccesskey($input, $this->rootDir);
@@ -120,13 +121,36 @@ protected function executeLocked(InputInterface $input, OutputInterface $output)
         return 0;
     }
 
+    /**
+     * Adds the .htaccess file or merges it with an existing one.
+     */
+    private function addHtaccess(string $webDir): void
+    {
+        $htaccess = __DIR__.'/../Resources/skeleton/web/.htaccess';
+
+        if (!file_exists($webDir.'/.htaccess')) {
+            $this->fs->copy($htaccess, $webDir.'/.htaccess', true);
+
+            return;
+        }
+
+        $existingContent = file_get_contents($webDir.'/.htaccess');
+
+        // Return if there already is a rewrite rule
+        if (preg_match('/^\s*RewriteRule\s/im', $existingContent)) {
+            return;
+        }
+
+        $this->fs->dumpFile($webDir.'/.htaccess', $existingContent."\n\n".file_get_contents($htaccess));
+    }
+
     /**
      * Adds files from Resources/skeleton/web to the application's web directory.
      */
     private function addFiles(string $webDir, bool $dev = true): void
     {
         /** @var SplFileInfo[] $finder */
-        $finder = Finder::create()->files()->ignoreDotFiles(false)->in(__DIR__.'/../Resources/skeleton/web');
+        $finder = Finder::create()->files()->in(__DIR__.'/../Resources/skeleton/web');
 
         foreach ($finder as $file) {
             if ($this->isExistingOptionalFile($file, $webDir)) {
@@ -218,7 +242,6 @@ private function addToDotEnv(string $projectDir, string $key, string $value): vo
     private function isExistingOptionalFile(SplFileInfo $file, string $webDir): bool
     {
         static $optional = [
-            '.htaccess',
             'favicon.ico',
             'robots.txt',
         ];
diff --git a/manager-bundle/tests/Command/InstallWebDirCommandTest.php b/manager-bundle/tests/Command/InstallWebDirCommandTest.php
index 5c3ce800924..62996fff973 100644
--- a/manager-bundle/tests/Command/InstallWebDirCommandTest.php
+++ b/manager-bundle/tests/Command/InstallWebDirCommandTest.php
@@ -105,7 +105,6 @@ public function testCommandDoesNotOverrideOptionals(): void
         }
 
         static $optional = [
-            '.htaccess',
             'favicon.ico',
             'robots.txt',
         ];
@@ -122,6 +121,40 @@ public function testCommandDoesNotOverrideOptionals(): void
         }
     }
 
+    public function testHtaccessIsNotChangedIfRewriteRuleExists(): void
+    {
+        $existingHtaccess = <<<'EOT'
+<IfModule mod_headers.c>
+  RewriteRule ^ %{ENV:BASE}/app.php [L]
+</IfModule>
+EOT;
+
+        $this->filesystem->dumpFile($this->getTempDir().'/web/.htaccess', $existingHtaccess);
+
+        $commandTester = new CommandTester($this->command);
+        $commandTester->execute([]);
+
+        $this->assertStringEqualsFile($this->getTempDir().'/web/.htaccess', $existingHtaccess);
+    }
+
+    public function testHtaccessIsChangedIfRewriteRuleDoesNotExists(): void
+    {
+        $existingHtaccess = <<<'EOT'
+# Enable PHP 7.2
+AddHandler application/x-httpd-php72 .php
+EOT;
+
+        $this->filesystem->dumpFile($this->getTempDir().'/web/.htaccess', $existingHtaccess);
+
+        $commandTester = new CommandTester($this->command);
+        $commandTester->execute([]);
+
+        $this->assertStringEqualsFile(
+            $this->getTempDir().'/web/.htaccess',
+            $existingHtaccess."\n\n".file_get_contents(__DIR__.'/../../src/Resources/skeleton/web/.htaccess')
+        );
+    }
+
     public function testCommandRemovesInstallPhp(): void
     {
         $this->filesystem->dumpFile($this->getTempDir().'/web/install.php', 'foobar-content');