diff --git a/.github/workflows/cygwin.yml b/.github/workflows/cygwin.yml
index 7e73a360f..2f16c8c5a 100644
--- a/.github/workflows/cygwin.yml
+++ b/.github/workflows/cygwin.yml
@@ -37,6 +37,7 @@ jobs:
     # install doc tools
     - run: dnf install -y dblatex docbook2X docbook-xsl xmlto
     - run: dnf install -y python3 python3-lxml python3-ply
+    - run: fmtutil-sys --byfmt pdflatex && texhash
 
     # build
     - run: mkdir build install