diff --git a/sundown/autolink.c b/sundown/autolink.c
index 00e2f3e..35b5298 100644
--- a/sundown/autolink.c
+++ b/sundown/autolink.c
@@ -42,7 +42,6 @@ ishashtagend(char c)
 int
 sd_autolink_issafe(const uint8_t *link, size_t link_len)
 {
-	static const size_t valid_uris_count = 13;
 	static const char *valid_uris[] = {
 		"§",
 		"@", "&", "%", "#",
@@ -50,6 +49,7 @@ sd_autolink_issafe(const uint8_t *link, size_t link_len)
 		"ytdl://",
 		"/", "http://", "https://", "ftp://", "mailto:"
 	};
+	static const size_t valid_uris_count = sizeof(valid_uris)/sizeof(valid_uris[0]);
 
 	size_t i;