diff --git a/include/osmocom/core/msgb.h b/include/osmocom/core/msgb.h
index 1e2b023..3fdb189 100644
--- a/include/osmocom/core/msgb.h
+++ b/include/osmocom/core/msgb.h
@@ -70,6 +70,8 @@
 	int old_size, int new_size);
 extern struct msgb *msgb_copy(const struct msgb *msg, const char *name);
 extern struct msgb *msgb_copy_c(const void *ctx, const struct msgb *msg, const char *name);
+extern struct msgb *msgb_copy_resize(const struct msgb *msg, uint16_t new_len, const char *name);
+extern struct msgb *msgb_copy_resize_c(const void *ctx, const struct msgb *msg, uint16_t new_len, const char *name);
 static int msgb_test_invariant(const struct msgb *msg) __attribute__((pure));
 
 /*! Free all msgbs from a queue built with msgb_enqueue().