1 files changed, 5 insertions, 1 deletions
diff --git a/src/blocks.c b/src/blocks.c
index 95a87c3..17288df 100644
--- a/src/blocks.c
+++ b/src/blocks.c
@@ -631,7 +631,11 @@ S_process_line(cmark_parser *parser, const unsigned char *buffer, bufsize_t byte
 	cmark_chunk input;
 	bool maybe_lazy;
 
-	cmark_strbuf_put(parser->curline, buffer, bytes);
+	if (parser->options & CMARK_OPT_VALIDATE_UTF8) {
+		utf8proc_check(parser->curline, buffer, bytes);
+	} else {
+		cmark_strbuf_put(parser->curline, buffer, bytes);
+	}
 	parser->offset = 0;
 	parser->column = 0;
 	parser->blank = false;