# No spaces in source and semantic model names

| require\_source\_and\_semantic\_model\_names\_without\_spaces | dbt **Latest** | dbt Core |
| ------------------------------------------------------------- | -------------- | -------- |
| Introduced                                                    | 2026.4         | 1.12.0   |
| Matured (default → `true`)                                    | —              | —        |
| Removed                                                       | —              | —        |

The `require_source_and_semantic_model_names_without_spaces` flag is set to `false` by default.

Source names and semantic model names should contain letters, numbers, and underscores — *not* spaces. dbt raises the [`ResourceNamesWithSpacesDeprecation`](../../deprecations.md#resourcenameswithspacesdeprecation) warning if it detects a space in a source name or semantic model name. When the `require_source_and_semantic_model_names_without_spaces` flag is set to `true`, dbt raises an error.

This flag extends [`require_resource_names_without_spaces`](./require_resource_names_without_spaces.md) to cover source and semantic model names specifically.

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