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 d72423b6..c5ee5576 100644
--- a/src/libsodium/crypto_aead/aes256gcm/aesni/aead_aes256gcm_aesni.c
+++ b/src/libsodium/crypto_aead/aes256gcm/aesni/aead_aes256gcm_aesni.c
@@ -790,7 +790,7 @@ crypto_aead_aes256gcm_encrypt(unsigned char *c,
                               const unsigned char *npub,
                               const unsigned char *k)
 {
-    crypto_aead_aes256gcm_state ctx;
+    CRYPTO_ALIGN(16) crypto_aead_aes256gcm_state ctx;
 
     crypto_aead_aes256gcm_beforenm(&ctx, k);
 
@@ -810,7 +810,7 @@ crypto_aead_aes256gcm_decrypt(unsigned char *m,
                               const unsigned char *npub,
                               const unsigned char *k)
 {
-    crypto_aead_aes256gcm_state ctx;
+    CRYPTO_ALIGN(16) crypto_aead_aes256gcm_state ctx;
 
     crypto_aead_aes256gcm_beforenm(&ctx, k);