@@ -297,7 +297,7 @@ runTectonic verbosity program args' tmpDir' source = do
297297 putStrLn "[makePDF] Running"
298298 BL.hPutStr stdout out
299299 putStr "\n"
300− let pdfFile = tmpDir </> "texput.pdf"
300+ let pdfFile = tmpDir ++ "/texput.pdf"
301301 (_, pdf) <- getResultingPDF Nothing pdfFile
302302 return (exit, out, pdf)
303303
@@ -335,7 +335,7 @@ runTeXProgram verbosity program args runNumber numRuns tmpDir' source = do
335335 [x] -> drop 8 x
336336 _ -> tmpDir'
337337 liftIO $ createDirectoryIfMissing True tmpDir
338− let file = tmpDir </> "input.tex"
338+ let file = tmpDir ++ "/input.tex" -- note: tmpDir has / path separators
339339 exists <- liftIO $ doesFileExist file
340340 unless exists $ liftIO $ BS.writeFile file $ UTF8.fromText source
341341 let isLatexMk = takeBaseName program == "latexmk"