diff --git a/src/libsodium/include/sodium/crypto_sign.h b/src/libsodium/include/sodium/crypto_sign.h
index 09c1df1e..c5f19e7f 100644
--- a/src/libsodium/include/sodium/crypto_sign.h
+++ b/src/libsodium/include/sodium/crypto_sign.h
@@ -6,6 +6,7 @@
 #define crypto_sign crypto_sign_ed25519
 #define crypto_sign_open crypto_sign_ed25519_open
 #define crypto_sign_keypair crypto_sign_ed25519_keypair
+#define crypto_sign_seed_keypair crypto_sign_ed25519_seed_keypair
 #define crypto_sign_BYTES crypto_sign_ed25519_BYTES
 #define crypto_sign_PUBLICKEYBYTES crypto_sign_ed25519_PUBLICKEYBYTES
 #define crypto_sign_SECRETKEYBYTES crypto_sign_ed25519_SECRETKEYBYTES