diff --git a/make-includes/build_lecture_rules.make b/make-includes/build_lecture_rules.make
index 715c530..2e7b8e3 100644
--- a/make-includes/build_lecture_rules.make
+++ b/make-includes/build_lecture_rules.make
@@ -36,7 +36,7 @@
 # document cross references, but won't get regenerated if the final target
 # PDF files exist. They will be caught by by the "clean" target though.
 #
-TIDY_FILES+=*.tmp *.out *.log *.nav *.toc *.snm *.head *.dvi \
+TIDY_FILES+=*.tmp *.out *.log *.nav *.toc *.snm *.head *.dvi *.vrb _minted* \
 	slides-combined.pdf slides-notes.pdf
 CLEAN_FILES+=*.aux *.pdf