diff --git a/include/osmocom/core/msgb.h b/include/osmocom/core/msgb.h
index 644a639..9ffc64e 100644
--- a/include/osmocom/core/msgb.h
+++ b/include/osmocom/core/msgb.h
@@ -74,6 +74,9 @@
 extern void msgb_reset(struct msgb *m);
 uint16_t msgb_length(const struct msgb *msg);
 extern const char *msgb_hexdump(const struct msgb *msg);
+extern int msgb_resize_area(struct msgb *msg, uint8_t *area,
+	int old_size, int new_size);
+extern struct msgb *msgb_copy(const struct msgb *msg, const char *name);
 
 #ifdef MSGB_DEBUG
 #include <osmocom/core/panic.h>