diff --git a/client.rkt b/client.rkt
index 1ec14be..481f69b 100644
--- a/client.rkt
+++ b/client.rkt
@@ -109,7 +109,6 @@
                 [(and (>= status 20)
                       (<= status 29))
 
-
                  (let-values ([(doc) (gmi:parse (port->lines c-in))]
                               [(db-in db-out) (make-pipe #f)])
 
@@ -150,4 +149,6 @@
                       (<= status 69))
                  (displayln "certificate handling not yet implemented")]))))
 
-          (iter url 5))))
+        (if (not (string=? (url-scheme url) "gemini"))
+            (printf "unsupported url: ~a~n" (url->string url))
+            (iter url 5)))))