diff --git a/lib/kamal/configuration.rb b/lib/kamal/configuration.rb
index cafc25d4..5099e9ab 100644
--- a/lib/kamal/configuration.rb
+++ b/lib/kamal/configuration.rb
@@ -250,8 +250,9 @@ class Kamal::Configuration
   end
 
   def proxy_publish_args(http_port, https_port, bind_ip = nil)
-    bind_ip = bind_ip ? "#{bind_ip}:" : ""
-    argumentize "--publish", [ "#{bind_ip}#{http_port}:#{PROXY_HTTP_PORT}", "#{bind_ip}#{https_port}:#{PROXY_HTTPS_PORT}" ]
+    publish_http = [ bind_ip, http_port, PROXY_HTTP_PORT ].compact.join(":")
+    publish_https = [ bind_ip, https_port, PROXY_HTTPS_PORT ].compact.join(":")
+    argumentize "--publish", [ publish_http, publish_https ]
   end
 
   def proxy_logging_args(max_size)