diff --git a/types/sodium-native/index.d.ts b/types/sodium-native/index.d.ts
index 92c9f86d0b..1b6779e105 100644
--- a/types/sodium-native/index.d.ts
+++ b/types/sodium-native/index.d.ts
@@ -114,6 +114,9 @@ export const crypto_secretstream_xchacha20poly1305_TAG_PUSH: number;
 export const crypto_secretstream_xchacha20poly1305_TAG_REKEY: number;
 /** NOTE: Unofficial constant */
 export const crypto_secretstream_xchacha20poly1305_TAGBYTES: number;
+export const crypto_box_SEALBYTES: number;
+export const crypto_box_PUBLICKEYBYTES: number;
+export const crypto_box_SECRETKEYBYTES: number;
 
 /**
  * Zero out the data in `buffer`.
diff --git a/types/sodium-native/sodium-native-tests.ts b/types/sodium-native/sodium-native-tests.ts
index 718394bd39..fa856592c7 100644
--- a/types/sodium-native/sodium-native-tests.ts
+++ b/types/sodium-native/sodium-native-tests.ts
@@ -98,3 +98,11 @@ sc.fill(0xcd, 0, sodium.crypto_core_ed25519_UNIFORMBYTES);
 sc2.fill(0x42, 0, sodium.crypto_core_ed25519_UNIFORMBYTES);
 sodium.crypto_core_ed25519_scalar_add(sc, sc2, sc);
 sodium.crypto_core_ed25519_scalar_sub(sc, sc, sc2);
+
+const publicKey = sodium.sodium_malloc(sodium.crypto_box_PUBLICKEYBYTES);
+const secretKey = sodium.sodium_malloc(sodium.crypto_box_SECRETKEYBYTES);
+sodium.crypto_box_keypair(publicKey, secretKey);
+const message = sodium.sodium_malloc(4);
+const cipherText = sodium.sodium_malloc(message.length + sodium.crypto_box_SEALBYTES);
+sodium.crypto_box_seal(cipherText, message, publicKey);
+sodium.crypto_box_seal_open(message, cipherText, publicKey, secretKey);