diff --git a/src/syntax.c b/src/syntax.c
index 825ef88..e321313 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -3354,6 +3354,7 @@
     {
 	vim_free(SYN_ITEMS(buf)[i].sp_cont_list);
 	vim_free(SYN_ITEMS(buf)[i].sp_next_list);
+	vim_free(SYN_ITEMS(buf)[i].sp_syn.cont_in_list);
     }
 }