diff --git a/presto2gemini.py b/presto2gemini.py
index eb90e58..2104065 100755
--- a/presto2gemini.py
+++ b/presto2gemini.py
@@ -20,7 +20,7 @@ import shutil
 # http://python-requests.org/
 import requests
 
-PRESTO_URL = "http://www.sidc.be/archive/product/presto"
+PRESTO_URL = "https://www.sidc.be/archive/product/presto"
 SOURCE_URL = "https://forge.chapril.org/bortzmeyer/presto2gemini"
 
 # Defaults
@@ -129,6 +129,9 @@ if not dest_dir.endswith("/"):
 input_ok = False
 if input is None:
     r = requests.get(url, allow_redirects = False)
+    if r.status_code != 200:
+        print("Wrong status code %s from %s" % (r.status_code, PRESTO_URL), file=sys.stderr)
+        sys.exit(1)
     if r.status_code == 200 and r.text != "" and r.text != "\r\n" and r.text != "\n": # Yes,
         # when there is no alert, they reply with 200 and an empty file :-(
         raw = open("%s%s" % (raw_file_dir, date), "w")