diff --git a/src/libsodium/crypto_aead/xchacha20poly1305/sodium/aead_xchacha20poly1305.c b/src/libsodium/crypto_aead/xchacha20poly1305/sodium/aead_xchacha20poly1305.c
index c18cdf94..04971a82 100644
--- a/src/libsodium/crypto_aead/xchacha20poly1305/sodium/aead_xchacha20poly1305.c
+++ b/src/libsodium/crypto_aead/xchacha20poly1305/sodium/aead_xchacha20poly1305.c
@@ -53,7 +53,7 @@ crypto_aead_xchacha20poly1305_ietf_encrypt(unsigned char *c,
     unsigned long long clen = 0ULL;
     int                ret;
 
-    if (mlen > UINT64_MAX - crypto_aead_xchacha20poly1305_ietf_ABYTES) {
+    if (mlen > crypto_aead_xchacha20poly1305_ietf_MESSAGEBYTES_MAX) {
         sodium_misuse();
     }
     ret = crypto_aead_xchacha20poly1305_ietf_encrypt_detached