diff --git a/qutebrowser/utils/urlutils.py b/qutebrowser/utils/urlutils.py
index b5c07c65e..69095a4af 100644
--- a/qutebrowser/utils/urlutils.py
+++ b/qutebrowser/utils/urlutils.py
@@ -85,9 +85,10 @@ def _is_url_naive(urlstr):
     else:
         # Valid IPv4/IPv6 address
         return True
-    if re.search(r'^[0-9.]+$', urlstr):
-        # Qt treats things like "23.42" or "1337" as valid URLs which we don't
-        # want to. Note we already filtered *real* valid IPs above.
+    if re.search(r'^([0-9.]+|0x[a-fA-F0-9]+)$', urlstr):
+        # Qt treats things like "23.42" or "1337" or "0xDEAD" as valid URLs
+        # which we don't want to. Note we already filtered *real* valid IPs
+        # above.
         return False
     elif not url.isValid():
         return False