diff --git a/pandoc.cabal b/pandoc.cabal
index bb546926a..c7a7faa85 100644
--- a/pandoc.cabal
+++ b/pandoc.cabal
@@ -79,6 +79,7 @@ data-files:
                  data/docx/_rels/.rels
                  data/docx/docProps/app.xml
                  data/docx/docProps/core.xml
+                 data/docx/docProps/custom.xml
                  data/docx/word/document.xml
                  data/docx/word/fontTable.xml
                  data/docx/word/comments.xml