diff --git a/include/libssh/messages.h b/include/libssh/messages.h
index e766d08b..4467902a 100644
--- a/include/libssh/messages.h
+++ b/include/libssh/messages.h
@@ -76,8 +76,8 @@ struct ssh_channel_request {
 
     /* X11 */
     uint8_t x11_single_connection;
-    const char *x11_auth_protocol;
-    const char *x11_auth_cookie;
+    char *x11_auth_protocol;
+    char *x11_auth_cookie;
     uint32_t x11_screen_number;
 };