diff --git a/electrum/util.py b/electrum/util.py
index b794bd1d1..d4ab1534a 100644
--- a/electrum/util.py
+++ b/electrum/util.py
@@ -622,6 +622,8 @@ def time_difference(distance_in_time, include_seconds):
         return "over %d years" % (round(distance_in_minutes / 525600))
 
 mainnet_block_explorers = {
+    'Bitupper Explorer': ('https://bitupper.com/en/explorer/bitcoin/',
+                        {'tx': 'transactions/', 'addr': 'addresses/'}),
     'Biteasy.com': ('https://www.biteasy.com/blockchain/',
                         {'tx': 'transactions/', 'addr': 'addresses/'}),
     'Bitflyer.jp': ('https://chainflyer.bitflyer.jp/',