diff --git a/.gitignore b/.gitignore
index b3d797d..551a40b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 book.pdf
 book.tex
+diff.pdf
diff --git a/flake.nix b/flake.nix
index 0a00032..4b9e391 100644
--- a/flake.nix
+++ b/flake.nix
@@ -119,7 +119,7 @@
                 mv book.tex ../sent.tex
                 popd
                 mkdir build
-                latexdiff sent.tex book.tex > diff.tex
+                latexdiff --math-markup=whole -t CFONT sent.tex book.tex > diff.tex
                 latexmk -f -pdf -lualatex -interaction=nonstopmode -output-directory=build book.tex
                 latexmk -f -pdf -lualatex -interaction=nonstopmode -output-directory=build diff.tex
                 mv build/book.pdf build/diff.pdf .