diff --git a/src/libsodium/include/sodium/crypto_aead_chacha20poly1305.h b/src/libsodium/include/sodium/crypto_aead_chacha20poly1305.h
index a575ec71..b6e04851 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) - 64ULL) - crypto_aead_chacha20poly1305_ietf_ABYTES)
+               (64ULL * ((1ULL << 32) - 1ULL)) - crypto_aead_chacha20poly1305_ietf_ABYTES)
 SODIUM_EXPORT
 size_t crypto_aead_chacha20poly1305_ietf_messagebytes_max(void);
 
diff --git a/src/libsodium/include/sodium/crypto_secretstream_xchacha20poly1305.h b/src/libsodium/include/sodium/crypto_secretstream_xchacha20poly1305.h
index 74a0c9b2..dac273b5 100644
--- a/src/libsodium/include/sodium/crypto_secretstream_xchacha20poly1305.h
+++ b/src/libsodium/include/sodium/crypto_secretstream_xchacha20poly1305.h
@@ -31,7 +31,7 @@ size_t crypto_secretstream_xchacha20poly1305_keybytes(void);
 
 #define crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX \
     SODIUM_MIN(SODIUM_SIZE_MAX - crypto_secretstream_xchacha20poly1305_ABYTES, \
-              (64ULL * (1ULL << 32) - 2ULL))
+              (64ULL * ((1ULL << 32) - 2ULL)))
 SODIUM_EXPORT
 size_t crypto_secretstream_xchacha20poly1305_messagebytes_max(void);