# HP6003: suppressHydrationWarning with nothing to suppress
> HP6003 (suppression-unused) means an element has suppressHydrationWarning but its server and client output are identical. Remove it before it hides a bug.
Source: https://hydration.jscrate.dev/docs/issues/hp6003
Last updated: 2026-09-18
HP6003 (`suppression-unused`) means an element is marked with
`suppressHydrationWarning`, but its server and client output are identical:
there is nothing to suppress. The attribute only hides future mistakes on that
element. Remove it, so real mismatches are reported later. It is reported only
with `checks.suppressedWarnings: 'strict'`.
| | |
| --- | --- |
| Code | `HP6003` |
| Name | `suppression-unused` |
| Default severity | Info |
| Group | suppressHydrationWarning audit |
| What it means | The element is marked with suppressHydrationWarning but its server and client output are identical. |
## What the HP6003 suppression unused finding means
During hydration, hydration-proof compares each marked element's text and
attributes with the server HTML. When none of them differs in the tested
scenario, it reports:
```text
suppressHydrationWarning is set, but the server and client output are identical.
```
The finding is info and off by default. Turn it on to clean up old
suppressions:
```ts title="hydration-proof.config.ts"
import { defineConfig } from "hydration-proof";
export default defineConfig({
checks: { suppressedWarnings: "strict" },
});
```
A difference can depend on the environment. An element that matches in the
default scenario may differ in another timezone or theme, so check the
finding across your [scenarios](https://hydration.jscrate.dev/docs/scenarios) before you remove the
attribute.
## Likely causes
- The value that used to differ was fixed, and the attribute stayed.
- The attribute was copied along with a component.
- A design system passes `suppressHydrationWarning` to elements that never
need it.
## How to fix it
Remove `suppressHydrationWarning` if nothing on this element differs, so real
mismatches are not hidden later.
```tsx title="components/page-title.tsx"
// Before: static text, nothing can differ
export function PageTitle() {
return Dashboard
;
}
```
```tsx title="components/page-title.tsx"
export function PageTitle() {
return Dashboard
;
}
```
Keep it where the difference only shows up in some environments, such as
`` with a theme script in a dark mode scenario, and ignore the finding
for that element (see [ignoring findings](https://hydration.jscrate.dev/docs/ignoring)).
## Catch it with ESLint
[`audit-suppress-hydration-warning`](https://hydration.jscrate.dev/docs/rules/audit-suppress-hydration-warning)
reports the attribute on elements whose attributes and text are all static
(`unused`), and its suggestion removes it.
## Related
- [HP6001: a mismatch hidden by suppressHydrationWarning](https://hydration.jscrate.dev/docs/issues/hp6001)
- [HP6002: suppression cannot hide a structural difference](https://hydration.jscrate.dev/docs/issues/hp6002)
- [Using suppressHydrationWarning safely](https://hydration.jscrate.dev/docs/guides/suppresshydrationwarning)
- [The configuration reference](https://hydration.jscrate.dev/docs/configuration)