diff --git a/Extractor/ExposedRoutesExtractor.php b/Extractor/ExposedRoutesExtractor.php
index 51541aa..fd20c7e 100644
--- a/Extractor/ExposedRoutesExtractor.php
+++ b/Extractor/ExposedRoutesExtractor.php
@@ -120,7 +120,7 @@ public function getHost(): string
     /**
      * {@inheritDoc}
      */
-    public function getPort(): string
+    public function getPort(): ?string
     {
         $requestContext = $this->router->getContext();
 
diff --git a/Extractor/ExposedRoutesExtractorInterface.php b/Extractor/ExposedRoutesExtractorInterface.php
index 2aef271..2a4d041 100644
--- a/Extractor/ExposedRoutesExtractorInterface.php
+++ b/Extractor/ExposedRoutesExtractorInterface.php
@@ -43,7 +43,7 @@ public function getHost(): string;
     /**
      * Get the port from RequestContext, only if non standard port (Eg: "8080")
      */
-    public function getPort(): string;
+    public function getPort(): ?string;
 
     /**
      * Get the scheme from RequestContext