diff --git a/http-message/Response.php b/http-message/Response.php
index c0b1781b..ebceebd8 100644
--- a/http-message/Response.php
+++ b/http-message/Response.php
@@ -113,15 +113,6 @@ class Response implements ResponseInterface
 		return $this->hasHeader('Content-Type');
 	}
 
-
-	/**
-	 * @return string
-	 */
-	#[Pure] public function getContentType(): string
-	{
-		return $this->getHeaderLine('Content-Type');
-	}
-
 	/**
 	 * @param string|null $value
 	 * @return Response
diff --git a/http-server/Constrict/ResponseInterface.php b/http-server/Constrict/ResponseInterface.php
index 036b66b2..053b97c3 100644
--- a/http-server/Constrict/ResponseInterface.php
+++ b/http-server/Constrict/ResponseInterface.php
@@ -43,9 +43,9 @@ interface ResponseInterface extends \Psr\Http\Message\ResponseInterface
 
 
 	/**
-	 * @return string
+	 * @return string|null
 	 */
-	public function getContentType(): string;
+	public function getContentType(): ?string;
 
 
 	/**