diff --git a/lib/grpc/server/adapters/cowboy.ex b/lib/grpc/server/adapters/cowboy.ex
index 3395c4a8..3dd327e8 100644
--- a/lib/grpc/server/adapters/cowboy.ex
+++ b/lib/grpc/server/adapters/cowboy.ex
@@ -293,6 +293,9 @@ defmodule GRPC.Server.Adapters.Cowboy do
         :undefined ->
           raise "undefined address for ranch server"
 
+        :local ->
+          "local"
+
         addr ->
           "#{:inet.ntoa(addr)}:#{port}"
       end