diff --git a/Formula/nats-server.rb b/Formula/nats-server.rb
index 18637602ddfa..da36ffa98836 100644
--- a/Formula/nats-server.rb
+++ b/Formula/nats-server.rb
@@ -25,15 +25,17 @@ def install
 
   test do
     port = free_port
+    http_port = free_port
     fork do
       exec bin/"nats-server",
            "--port=#{port}",
+           "--http_port=#{http_port}",
            "--pid=#{testpath}/pid",
            "--log=#{testpath}/log"
     end
     sleep 3
 
-    assert_match version.to_s, shell_output("curl localhost:#{port}")
+    assert_match version.to_s, shell_output("curl localhost:#{http_port}/varz")
     assert_predicate testpath/"log", :exist?
   end
 end