diff --git a/src/Middleware/ResponseHeaderMiddleware.php b/src/Middleware/ResponseHeaderMiddleware.php
index 9872192..3f3d6ca 100644
--- a/src/Middleware/ResponseHeaderMiddleware.php
+++ b/src/Middleware/ResponseHeaderMiddleware.php
@@ -45,8 +45,11 @@ public function addHeaders(ResponseInterface $response, string $route): Response
                 if (! array_key_exists('value', $data)) {
                     continue;
                 }
-                $overwrite = isset($data['overwrite']) && $data['overwrite'] === true;
-                if ($overwrite) {
+                $addHeader = true;
+                if ($response->hasHeader($header)) {
+                    $addHeader = isset($data['overwrite']) && $data['overwrite'] === true;
+                }
+                if ($addHeader === true) {
                     $response = $response->withHeader($header, $data['value']);
                 }
             }
diff --git a/test/Middleware/ResponseHeaderMiddlewareTest.php b/test/Middleware/ResponseHeaderMiddlewareTest.php
index e3839a8..91eddb9 100644
--- a/test/Middleware/ResponseHeaderMiddlewareTest.php
+++ b/test/Middleware/ResponseHeaderMiddlewareTest.php
@@ -5,6 +5,7 @@
 namespace DotTest\ResponseHeader;
 
 use Dot\ResponseHeader\Middleware\ResponseHeaderMiddleware;
+use Laminas\Diactoros\Response;
 use PHPUnit\Framework\MockObject\Exception;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
@@ -47,10 +48,41 @@ public function testProcess()
         $this->assertIsString($data->getReasonPhrase());
     }
 
-    public function testAddHeaders()
+    public function testWillNotAddHeadersWithoutCommonWithoutRouteSpecificHeadersConfigured(): void
     {
-        $data = $this->responseHeader->addHeaders($this->responseInterface, '');
+        $responseHeader = new ResponseHeaderMiddleware([]);
 
-        $this->assertInstanceOf(ResponseInterface::class, $data);
+        $response = new Response();
+        $response = $responseHeader->addHeaders($response, 'test');
+
+        $this->assertEmpty($response->getHeaders());
+    }
+
+    public function testWillAddHeadersWithCommonWithoutRouteSpecificHeadersConfigured(): void
+    {
+        $responseHeader = new ResponseHeaderMiddleware([
+            '*' => [
+                'CustomHeader1' => [
+                    'value'     => 'CustomHeader1-Value',
+                    'overwrite' => true,
+                ],
+                'CustomHeader2' => [
+                    'value'     => 'CustomHeader2-Value',
+                    'overwrite' => false,
+                ],
+            ],
+        ]);
+
+        $response = new Response();
+
+        $response = $responseHeader->addHeaders($response, 'test');
+        $this->assertEmpty($response->getHeaders());
+        $this->assertFalse($response->hasHeader('CustomHeader1'));
+        $this->assertFalse($response->hasHeader('CustomHeader2'));
+
+        $response = $responseHeader->addHeaders($response, '*');
+        $this->assertCount(2, $response->getHeaders());
+        $this->assertTrue($response->hasHeader('CustomHeader1'));
+        $this->assertTrue($response->hasHeader('CustomHeader2'));
     }
 }