diff --git a/lib/puppet-languageserver-sidecar/puppet_strings_helper.rb b/lib/puppet-languageserver-sidecar/puppet_strings_helper.rb
index 725b67b3..56af617b 100644
--- a/lib/puppet-languageserver-sidecar/puppet_strings_helper.rb
+++ b/lib/puppet-languageserver-sidecar/puppet_strings_helper.rb
@@ -370,7 +370,7 @@ def to_h
     end
 
     def to_json(*options)
-      JSON.generate(to_h, options)
+      JSON.generate(to_h, *options)
     end
 
     # Deserialisation