diff --git a/src/libsodium/crypto_aead/aes256gcm/aesni/aead_aes256gcm_aesni.c b/src/libsodium/crypto_aead/aes256gcm/aesni/aead_aes256gcm_aesni.c
index 533d0970..31f12dae 100644
--- a/src/libsodium/crypto_aead/aes256gcm/aesni/aead_aes256gcm_aesni.c
+++ b/src/libsodium/crypto_aead/aes256gcm/aesni/aead_aes256gcm_aesni.c
@@ -838,7 +838,7 @@ crypto_aead_aes256gcm_abytes(void)
 size_t
 crypto_aead_aes256gcm_statebytes(void)
 {
-    return sizeof(crypto_aead_aes256gcm_state);
+    return (sizeof(crypto_aead_aes256gcm_state) + (size_t) 15U) & ~(size_t) 15U;
 }
 
 #else