diff --git a/include/libssh/curve25519.h b/include/libssh/curve25519.h
index a84326b9..e5691157 100644
--- a/include/libssh/curve25519.h
+++ b/include/libssh/curve25519.h
@@ -53,6 +53,7 @@ typedef unsigned char ssh_curve25519_privkey[CURVE25519_PRIVKEY_SIZE];
 int ssh_curve25519_init(ssh_session session);
 int curve25519_do_create_k(ssh_session session, ssh_curve25519_pubkey k);
 int ssh_curve25519_create_k(ssh_session session, ssh_curve25519_pubkey k);
+int ssh_curve25519_build_k(ssh_session session);
 
 int ssh_client_curve25519_init(ssh_session session);
 void ssh_client_curve25519_remove_callbacks(ssh_session session);
diff --git a/src/curve25519.c b/src/curve25519.c
index 4172e4b3..c68fbc79 100644
--- a/src/curve25519.c
+++ b/src/curve25519.c
@@ -101,7 +101,7 @@ void ssh_client_curve25519_remove_callbacks(ssh_session session)
     ssh_packet_remove_callbacks(session, &ssh_curve25519_client_callbacks);
 }
 
-static int ssh_curve25519_build_k(ssh_session session)
+int ssh_curve25519_build_k(ssh_session session)
 {
     ssh_curve25519_pubkey k;
     int rc;