diff --git a/src/gz.in b/src/gz.in
index 14e456f..7f38bea 100755
--- a/src/gz.in
+++ b/src/gz.in
@@ -185,7 +185,8 @@ usage = 'The \'gz\' command provides a command line interface to the Gazebo'\
 
 # Used to align the commands and the description.
 padding_width = 15
-commands.each do |cmd, versions|
+commands.keys.sort.each do |cmd|
+  versions = commands[cmd]
   # Calculate the padding to add between the command and the description.
   padding_to_apply = padding_width - cmd.size - 1
   padding = ''