Fixed warnings.

1 files changed, 2 insertions, 2 deletions

diff --git a/upb/msg.c b/upb/msg.c
index 4125d4c..29ba2e1 100644
--- a/upb/msg.c
+++ b/upb/msg.c
@@ -158,8 +158,8 @@ void upb_msg_addunknown(upb_msg *msg, const char *data, size_t len) {
   in->unknown_len += len;
 }
 
-const char *upb_msg_getunknown(upb_msg *msg, size_t *len) {
-  upb_msg_internal* in = upb_msg_getinternal(msg);
+const char *upb_msg_getunknown(const upb_msg *msg, size_t *len) {
+  const upb_msg_internal* in = upb_msg_getinternal_const(msg);
   *len = in->unknown_len;
   return in->unknown;
 }