diff --git a/src/libsodium/include/sodium/crypto_box_curve25519xsalsa20poly1305.h b/src/libsodium/include/sodium/crypto_box_curve25519xsalsa20poly1305.h
index e733f499..2c9b5d6e 100644
--- a/src/libsodium/include/sodium/crypto_box_curve25519xsalsa20poly1305.h
+++ b/src/libsodium/include/sodium/crypto_box_curve25519xsalsa20poly1305.h
@@ -69,7 +69,8 @@ size_t crypto_box_curve25519xsalsa20poly1305_boxzerobytes(void);
     (crypto_box_curve25519xsalsa20poly1305_BOXZEROBYTES + \
      crypto_box_curve25519xsalsa20poly1305_MACBYTES)
 SODIUM_EXPORT
-size_t crypto_box_curve25519xsalsa20poly1305_zerobytes(void);
+size_t crypto_box_curve25519xsalsa20poly1305_zerobytes(void)
+            __attribute__ ((deprecated));
 
 SODIUM_EXPORT
 int crypto_box_curve25519xsalsa20poly1305(unsigned char *c,
@@ -78,7 +79,7 @@ int crypto_box_curve25519xsalsa20poly1305(unsigned char *c,
                                           const unsigned char *n,
                                           const unsigned char *pk,
                                           const unsigned char *sk)
-            __attribute__ ((warn_unused_result)) __attribute__ ((nonnull(1, 4, 5, 6)));
+            __attribute__ ((deprecated)) __attribute__ ((warn_unused_result)) __attribute__ ((nonnull(1, 4, 5, 6)));
 
 SODIUM_EXPORT
 int crypto_box_curve25519xsalsa20poly1305_open(unsigned char *m,
@@ -87,7 +88,7 @@ int crypto_box_curve25519xsalsa20poly1305_open(unsigned char *m,
                                                const unsigned char *n,
                                                const unsigned char *pk,
                                                const unsigned char *sk)
-            __attribute__ ((warn_unused_result)) __attribute__ ((nonnull(2, 4, 5, 6)));
+            __attribute__ ((deprecated)) __attribute__ ((warn_unused_result)) __attribute__ ((nonnull(2, 4, 5, 6)));
 
 SODIUM_EXPORT
 int crypto_box_curve25519xsalsa20poly1305_afternm(unsigned char *c,
@@ -95,7 +96,7 @@ int crypto_box_curve25519xsalsa20poly1305_afternm(unsigned char *c,
                                                   unsigned long long mlen,
                                                   const unsigned char *n,
                                                   const unsigned char *k)
-            __attribute__ ((nonnull(1, 4, 5)));
+            __attribute__ ((deprecated)) __attribute__ ((nonnull(1, 4, 5)));
 
 SODIUM_EXPORT
 int crypto_box_curve25519xsalsa20poly1305_open_afternm(unsigned char *m,
@@ -103,7 +104,7 @@ int crypto_box_curve25519xsalsa20poly1305_open_afternm(unsigned char *m,
                                                        unsigned long long clen,
                                                        const unsigned char *n,
                                                        const unsigned char *k)
-            __attribute__ ((warn_unused_result)) __attribute__ ((nonnull(2, 4, 5)));
+            __attribute__ ((deprecated)) __attribute__ ((warn_unused_result)) __attribute__ ((nonnull(2, 4, 5)));
 
 #ifdef __cplusplus
 }