diff --git a/Makefile b/Makefile
index c3967d69..aa6d0696 100644
--- a/Makefile
+++ b/Makefile
@@ -88,7 +88,8 @@ pytests: checkstyle_python
 	# GitHub CI
 	[ -z "$$CI" ] && pytest --doctest-modules --ignore=Tests/Perl \
 	              || pytest --doctest-modules --ignore=Tests/Perl \
-	                        --ignore-glob='*/latex_watch.t'
+	                        --ignore-glob='*/latex_watch.t' \
+							--ignore-glob='*/grammar.t'
 
 perltests: checkstyle_perl
 	perl Tests/Perl/*.t