diff --git a/src/http/response.cpp b/src/http/response.cpp
index 63cb475..9a3be78 100644
--- a/src/http/response.cpp
+++ b/src/http/response.cpp
@@ -3,7 +3,7 @@
 
 namespace Http
 {
-	std::vector<char> Response::Serialize()
+	std::vector<char> Response::Serialize() const
 		{
 			// TODO implement headers properly
 			std::stringstream ss;
diff --git a/src/http/response.hpp b/src/http/response.hpp
index 100d7d7..6d89e85 100644
--- a/src/http/response.hpp
+++ b/src/http/response.hpp
@@ -9,7 +9,7 @@ namespace Http
 		std::string contentType;
 		std::vector<char> content;
 
-		std::vector<char> Serialize();
+		std::vector<char> Serialize() const;
 
 		Response();
 	};