diff --git a/make-includes/build_lecture_rules.make b/make-includes/build_lecture_rules.make
index 6185df4..ad987c3 100644
--- a/make-includes/build_lecture_rules.make
+++ b/make-includes/build_lecture_rules.make
@@ -37,7 +37,7 @@
 # PDF files exist. They will be caught by by the "clean" target though.
 #
 TIDY_FILES+=*.tmp *.out *.log *.nav *.toc *.snm *.head *.dvi *.vrb _minted* \
-	slides-combined.pdf slides-notes.pdf
+	slides-combined.pdf slides-notes.pdf *.synctex.gz
 CLEAN_FILES+=*.aux *.pdf