diff --git a/scripts/mkdocs2pdf.py b/scripts/mkdocs2pdf.py
index b1ad16ead46dd8c6762a66bce055f8510247d0bc..efe540f15107696764b8906efe3370ac01e23d35 100644
--- a/scripts/mkdocs2pdf.py
+++ b/scripts/mkdocs2pdf.py
@@ -225,7 +225,7 @@ def buildDocForLang(lang):
     mergedDocFilename = mergedDocFilenamePrefix + lang
     mergedDocOutputPath = os.path.join(pdfBuildDir, mergedDocFilename)
     # remove internal links @TODO convert them to hyperref ?
-    s = re.sub(r'\[([^/\^]+?)\]?\([^ ]+?\.md\)', r'\1', s)
+    s = re.sub(r'\[([^/\^]+?)\]\([^ ]+?\.md\)', r'\1', s)
     with open('{}.md'.format(mergedDocOutputPath), 'w') as f:
         f.writelines(s)