diff --git a/src/libsodium/include/sodium/crypto_aead_aes256gcm.h b/src/libsodium/include/sodium/crypto_aead_aes256gcm.h
index 46a3800f..5e67aa99 100644
--- a/src/libsodium/include/sodium/crypto_aead_aes256gcm.h
+++ b/src/libsodium/include/sodium/crypto_aead_aes256gcm.h
@@ -52,7 +52,7 @@ size_t crypto_aead_aes256gcm_abytes(void);
 
 #define crypto_aead_aes256gcm_MESSAGEBYTES_MAX \
     SODIUM_MIN(SODIUM_SIZE_MAX - crypto_aead_aes256gcm_ABYTES, \
-               (16ULL * ((1ULL << 32) - 2ULL)) - crypto_aead_aes256gcm_ABYTES)
+               (16ULL * ((1ULL << 32) - 2ULL)))
 SODIUM_EXPORT
 size_t crypto_aead_aes256gcm_messagebytes_max(void);
 
diff --git a/src/libsodium/include/sodium/crypto_aead_chacha20poly1305.h b/src/libsodium/include/sodium/crypto_aead_chacha20poly1305.h
index b6e04851..8ab31243 100644
--- a/src/libsodium/include/sodium/crypto_aead_chacha20poly1305.h
+++ b/src/libsodium/include/sodium/crypto_aead_chacha20poly1305.h
@@ -32,7 +32,7 @@ size_t crypto_aead_chacha20poly1305_ietf_abytes(void);
 
 #define crypto_aead_chacha20poly1305_ietf_MESSAGEBYTES_MAX \
     SODIUM_MIN(SODIUM_SIZE_MAX - crypto_aead_chacha20poly1305_ietf_ABYTES, \
-               (64ULL * ((1ULL << 32) - 1ULL)) - crypto_aead_chacha20poly1305_ietf_ABYTES)
+               (64ULL * ((1ULL << 32) - 1ULL)))
 SODIUM_EXPORT
 size_t crypto_aead_chacha20poly1305_ietf_messagebytes_max(void);