diff --git a/src/SFML/Network/Ftp.cpp b/src/SFML/Network/Ftp.cpp
index c77ccd2fa..af3be1a43 100644
--- a/src/SFML/Network/Ftp.cpp
+++ b/src/SFML/Network/Ftp.cpp
@@ -463,7 +463,7 @@ Ftp::Response Ftp::getResponse()
                         }
 
                         // Save the remaining data for the next time getResponse() is called
-                        m_receiveBuffer.assign(buffer + static_cast<std::streamoff>(in.tellg()), length - static_cast<std::size_t>(in.tellg()));
+                        m_receiveBuffer.assign(buffer + static_cast<std::size_t>(in.tellg()), length - static_cast<std::size_t>(in.tellg()));
 
                         // Return the response code and message
                         return Response(static_cast<Response::Status>(code), message);