diff --git a/linkcheck/checker/httpurl.py b/linkcheck/checker/httpurl.py
index 5e20e108..e62d2637 100644
--- a/linkcheck/checker/httpurl.py
+++ b/linkcheck/checker/httpurl.py
@@ -19,6 +19,13 @@ Handle http links.
 """
 
 import requests
+# The validity of SSL certs is ignored to be able
+# the check the URL and recurse into it.
+# The warning about invalid SSL certs is given to the
+# user instead.
+import warnings
+warnings.simplefilter('ignore', requests.packages.urllib3.exceptions.InsecureRequestWarning)
+
 from cStringIO import StringIO
 
 from .. import (log, LOG_CHECK, strformat, mimeutil,