diff --git a/app/mailers/collaboration_mailer.rb b/app/mailers/collaboration_mailer.rb
index 5bc1c99d3..164ae705e 100644
--- a/app/mailers/collaboration_mailer.rb
+++ b/app/mailers/collaboration_mailer.rb
@@ -1,7 +1,7 @@
 class CollaborationMailer < ApplicationMailer
   default from: "collaboration@notebook.ai"
 
-  def contributor_invitation(inviter:, invite_email:, universe:)
+  def contributor_invitation(inviter, invite_email, universe)
     @inviter = inviter
     @universe = universe
 
diff --git a/app/services/contributor_service.rb b/app/services/contributor_service.rb
index 97007a1fb..d33f91204 100644
--- a/app/services/contributor_service.rb
+++ b/app/services/contributor_service.rb
@@ -1,5 +1,5 @@
 class ContributorService < Service
-  def self.invite_contributor_to_universe universe:, email:
+  def self.invite_contributor_to_universe(universe:, email:)
     # First, look up whether a user already exists for this invite
     related_user = User.find_by(email: email.downcase)
 
@@ -31,19 +31,19 @@ def self.invite_contributor_to_universe universe:, email:
     end
   end
 
-  def self.send_invite_email_to inviter:, email:, universe:
+  def self.send_invite_email_to(inviter:, email:, universe:)
     CollaborationMailer.contributor_invitation(
-      inviter: inviter,
-      invite_email: email,
-      universe: universe
+      inviter,
+      email,
+      universe
     ).deliver_now! if Rails.env.production?
   end
 
-  def self.send_contributor_notice_to inviter:, email:, universe:
+  def self.send_contributor_notice_to(inviter:, email:, universe:)
     CollaborationMailer.contributor_invitation(
-      inviter: inviter,
-      invite_email: email,
-      universe: universe
+      inviter,
+      email,
+      universe
     ).deliver_now! if Rails.env.production?
   end
 end