diff --git a/rsa-sign-tr.c b/rsa-sign-tr.c
index 54bf49fd1478e2cb375cea513454be36898d389f..59c9bd074d3e897299d302fe429e6a03efda19a1 100644
--- a/rsa-sign-tr.c
+++ b/rsa-sign-tr.c
@@ -128,10 +128,10 @@ rsa_compute_root_tr(const struct rsa_public_key *pub,
 }
 
 int
-rsa_sec_compute_root_tr(const struct rsa_public_key *pub,
-		        const struct rsa_private_key *key,
-		        void *random_ctx, nettle_random_func *random,
-		        mp_limb_t *x, const mp_limb_t *m, size_t mn)
+_rsa_sec_compute_root_tr(const struct rsa_public_key *pub,
+			 const struct rsa_private_key *key,
+			 void *random_ctx, nettle_random_func *random,
+			 mp_limb_t *x, const mp_limb_t *m, size_t mn)
 {
   mpz_t mz;
   mpz_t xz;