diff --git a/cookbooks/maintenance/recipes/users.rb b/cookbooks/maintenance/recipes/users.rb
index eb52b0a..446e7e1 100644
--- a/cookbooks/maintenance/recipes/users.rb
+++ b/cookbooks/maintenance/recipes/users.rb
@@ -31,7 +31,7 @@
   owner username
   group group
   mode 0600
-  only_if { !ssh_key.nil? || !ssh_key = '' }
+  only_if { ssh_key && ssh_key != '' }
 end
 
 file '/etc/sudoers.d/deploy_chef' do