--- a/lib/nettle/backport/rsa-sign-tr.c
+++ b/lib/nettle/backport/rsa-sign-tr.c
@@ -41,6 +41,7 @@
 
 #include "gmp-glue.h"
 #include <nettle/rsa.h>
+#define nettle_rsa_compute_root_tr _gnutls_nettle_backport_rsa_compute_root_tr
 #include "rsa-internal.h"
 
 #define MAX(a, b) ((a) > (b) ? (a) : (b))