diff --git a/src/market_mad/remotes/one/monitor b/src/market_mad/remotes/one/monitor
index b57cb17a34a..90d50d79913 100755
--- a/src/market_mad/remotes/one/monitor
+++ b/src/market_mad/remotes/one/monitor
@@ -85,6 +85,9 @@ class OneMarket
             p_uri   = URI(http_proxy)
             p_host  = p_uri.host
             p_port  = p_uri.port
+            # URI keeps percent escapes; proxy authentication needs decoded values.
+            p_user  = URI::DEFAULT_PARSER.unescape(p_uri.user) if p_uri.user
+            p_pass  = URI::DEFAULT_PARSER.unescape(p_uri.password) if p_uri.password
         else
             p_host  = nil
             p_port  = nil
@@ -96,6 +99,7 @@ class OneMarket
         req['User-Agent'] = @agent
 
         response = Net::HTTP.start(uri.hostname, uri.port, p_host, p_port,
+                                   p_user, p_pass,
                                    :use_ssl => uri.scheme == 'https') do |http|
             http.request(req)
         end