diff --git a/java/server/src/org/openqa/selenium/grid/commands/CompletionCommand.java b/java/server/src/org/openqa/selenium/grid/commands/CompletionCommand.java
index cf2155735bfd0..4c503ccbf720e 100644
--- a/java/server/src/org/openqa/selenium/grid/commands/CompletionCommand.java
+++ b/java/server/src/org/openqa/selenium/grid/commands/CompletionCommand.java
@@ -94,11 +94,11 @@ public Executable configure(PrintStream out, PrintStream err, String... args) {
 
       switch (commander.getParsedCommand()) {
         case "zsh":
-          outputZshCompletions(System.out);
+          outputZshCompletions(out);
           break;
 
         default:
-          System.err.println("Unrecognised shell: " + commander.getParsedCommand());
+          err.println("Unrecognised shell: " + commander.getParsedCommand());
           System.exit(1);
           break;
       }