diff --git a/src/libsodium/crypto_scalarmult/curve25519/donna_c64/api.h b/src/libsodium/crypto_scalarmult/curve25519/donna_c64/api.h
index 5c9bba7e..420e8c40 100644
--- a/src/libsodium/crypto_scalarmult/curve25519/donna_c64/api.h
+++ b/src/libsodium/crypto_scalarmult/curve25519/donna_c64/api.h
@@ -1,9 +1,6 @@
 
 #include "crypto_scalarmult_curve25519.h"
 
-#define crypto_scalarmult_curve25519_implementation_name \
-    crypto_scalarmult_curve25519_donna_c64_implementation_name
-
 #define crypto_scalarmult crypto_scalarmult_curve25519
 #define crypto_scalarmult_base crypto_scalarmult_curve25519_base