---
title: "How do I enable FIPS mode for NanoSSL?"
source_url: https://dev.digicert.com/trustcore-sdk/nanossl/faqs/how-do-i-enable-fips-mode-for-nanossl.html
---

**Question:** How do I enable FIPS mode for NanoSSL at runtime?

**Answer:**To enable or disable FIPS mode at runtime define the following build flags and runtime settings.

## Build flags

Define the following build flags:

- `__ENABLE_MOCANA_FIPS_MODULE__`
- `__ENABLE_MOCANA_SSL_FIPS__`

## Runtime settings

To enable or disable FIPS mode at runtime, use the following API:

```c
sbyte4 SSL_setFIPSEnabled(ubyte <1/0>)
```

where:

- 1: Enables FIPS
- 0: Disables FIPS