---
title: "misaligned-atomic-64"
description: "Detect misaligned 64-bit atomic field access on 32-bit targets."
image: "https://strider.gempir.com/og.png"
---

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# misaligned-atomic-64

**Default severity:** `error`

On 32-bit ARM, x86, and MIPS targets, callers must ensure that 64-bit words
passed to legacy `sync/atomic` functions are aligned to 8 bytes. Put the
64-bit atomic field first in its allocated struct, or use the typed atomic
wrappers that arrange their own alignment.

This check is target-aware and remains silent when loading a 64-bit build.

## Bad

```go
type counters struct {
ready uint32
total uint64 // may be misaligned on a 32-bit target
}
```

## Good

```go
type counters struct {
	total uint64
	ready uint32
}
```

Source: https://strider.gempir.com/analyzers/misaligned-atomic-64/index.mdx