diff --git a/src/formatitko/formatitko.py b/src/formatitko/formatitko.py
index 3e764ba..c48c3d8 100755
--- a/src/formatitko/formatitko.py
+++ b/src/formatitko/formatitko.py
@@ -2,9 +2,11 @@
 
 import argparse
 import sys
+import os
 import tempfile
 import subprocess
 import shutil
+from pathlib import Path
 
 # Import local files
 from .util import import_md
@@ -112,7 +114,12 @@ def main():
 		else:
 			filename = args.output_tex
 		outdir = tempfile.TemporaryDirectory(prefix="formatitko")
-		subprocess.run(["pdfcsplain", "-halt-on-error", "-output-directory="+outdir.name, "-jobname=formatitko", filename], check=True)
+
+		env = os.environ.copy()
+		d = Path("/".join(__file__.split("/")[:-1]))
+		env["TEXINPUTS"]=".:"+str(d/"tex")+":"+env.get("TEXINPUTS", "")
+
+		subprocess.run(["luatex", "-halt-on-error", "-output-directory="+outdir.name, "-jobname=formatitko", filename], check=True, env=env)
 		shutil.move(outdir.name+"/formatitko.pdf", args.output_pdf)
 
 	if args.deps is not None: