diff --git a/source/crypto.c b/source/crypto.c
index 4fb963e2..b84cfe22 100644
--- a/source/crypto.c
+++ b/source/crypto.c
@@ -109,12 +109,11 @@ static JSValue nx_crypto_sha256_hex(JSContext *ctx, JSValueConst this_val,
 	}
 	sha256CalculateHash(digest, str, size);
 	JS_FreeCString(ctx, str);
-	char *hex = js_malloc(ctx, (SHA256_HASH_SIZE * 2) + 1);
+	char hex[SHA256_HASH_SIZE * 2 + 1];
 	for (int i = 0; i < SHA256_HASH_SIZE; i++) {
 		snprintf(hex + i * 2, 3, "%02x", digest[i]);
 	}
 	JSValue hex_val = JS_NewString(ctx, hex);
-	js_free(ctx, hex);
 	js_free(ctx, digest);
 	return hex_val;
 }