Fix for pptxbuilder

[wandererfrog]

What does it do?

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Please mention in the format "Fixes #issueNumber" or "Closes #issueNumber".
This is important for semantic-release to correctly generate release tags and update issues.

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• Updated documentation (if applicable)
• Added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• My changes generate no new warnings