diff --git a/misc.c b/misc.c
index 2959060..ea1d821 100644
--- a/misc.c
+++ b/misc.c
@@ -745,7 +745,7 @@ md_final(md_ctx *ctx, BYTE *md)
 BOOL
 open_url(const wchar_t *url)
 {
-    if (!url || !wcsbegins(url, L"http"))
+    if (!url || (!wcsbegins(url, L"http://") && !wcsbegins(url, L"https://")))
     {
         return false;
     }