diff --git a/.latexmkrc b/.latexmkrc
index df1fa13..dad3c57 100644
--- a/.latexmkrc
+++ b/.latexmkrc
@@ -1,3 +1,3 @@
 $pdf_mode = 1;
 $pdflatex = 'pdflatex --shell-escape';
-$clean_ext = '%R_contourtmp0.dat %R_contourtmp0.table %R_contourtmp0.script thm';
+$clean_ext = '%R_contourtmp0.dat %R_contourtmp0.table %R_contourtmp0.script thm %R.bak*';