diff --git a/src/components/markdown-renderer/markdown-extension/legacy-short-codes/replace-legacy-pdf-short-code.ts b/src/components/markdown-renderer/markdown-extension/legacy-short-codes/replace-legacy-pdf-short-code.ts
index acbc37d3a..5670e102c 100644
--- a/src/components/markdown-renderer/markdown-extension/legacy-short-codes/replace-legacy-pdf-short-code.ts
+++ b/src/components/markdown-renderer/markdown-extension/legacy-short-codes/replace-legacy-pdf-short-code.ts
@@ -8,7 +8,7 @@ import markdownItRegex from 'markdown-it-regex'
 import type MarkdownIt from 'markdown-it/lib'
 import type { RegexOptions } from '../../../../external-types/markdown-it-regex/interface'
 
-export const legacyPdfRegex = /^{%pdf (\S*) *%}$/
+export const legacyPdfRegex = /^{%pdf\s+(\S*)\s*%}$/
 
 /**
  * Configure the given {@link MarkdownIt} to render legacy hedgedoc 1 pdf shortcodes as html links.