diff --git a/sundown/autolink.c b/sundown/autolink.c
index a67e6ca..ceaf530 100644
--- a/sundown/autolink.c
+++ b/sundown/autolink.c
@@ -42,11 +42,12 @@ ishashtagend(char c)
 int
 sd_autolink_issafe(const uint8_t *link, size_t link_len)
 {
-	static const size_t valid_uris_count = 12;
+	static const size_t valid_uris_count = 13;
 	static const char *valid_uris[] = {
 		"§",
 		"@", "&", "%", "#",
 		"gemini://", "gopher://",
+		"ytdl://",
 		"/", "http://", "https://", "ftp://", "mailto:"
 	};