diff --git a/src/libsodium/crypto_box/curve25519xchacha20poly1305/box_curve25519xchacha20poly1305.c b/src/libsodium/crypto_box/curve25519xchacha20poly1305/box_curve25519xchacha20poly1305.c
index 0d0965ed..aab38c04 100644
--- a/src/libsodium/crypto_box/curve25519xchacha20poly1305/box_curve25519xchacha20poly1305.c
+++ b/src/libsodium/crypto_box/curve25519xchacha20poly1305/box_curve25519xchacha20poly1305.c
@@ -21,7 +21,7 @@ crypto_box_curve25519xchacha20poly1305_seed_keypair(unsigned char *      pk,
     unsigned char hash[64];
 
     crypto_hash_sha512(hash, seed, 32);
-    memmove(sk, hash, 32);
+    memcpy(sk, hash, 32);
     sodium_memzero(hash, sizeof hash);
 
     return crypto_scalarmult_curve25519_base(pk, sk);
diff --git a/src/libsodium/crypto_box/curve25519xsalsa20poly1305/box_curve25519xsalsa20poly1305.c b/src/libsodium/crypto_box/curve25519xsalsa20poly1305/box_curve25519xsalsa20poly1305.c
index 61f02053..b506c6bf 100644
--- a/src/libsodium/crypto_box/curve25519xsalsa20poly1305/box_curve25519xsalsa20poly1305.c
+++ b/src/libsodium/crypto_box/curve25519xsalsa20poly1305/box_curve25519xsalsa20poly1305.c
@@ -16,7 +16,7 @@ crypto_box_curve25519xsalsa20poly1305_seed_keypair(unsigned char *      pk,
     unsigned char hash[64];
 
     crypto_hash_sha512(hash, seed, 32);
-    memmove(sk, hash, 32);
+    memcpy(sk, hash, 32);
     sodium_memzero(hash, sizeof hash);
 
     return crypto_scalarmult_curve25519_base(pk, sk);