diff --git a/app/models/rails_lti2_provider/tool.rb b/app/models/rails_lti2_provider/tool.rb
index a5ee616..754408a 100644
--- a/app/models/rails_lti2_provider/tool.rb
+++ b/app/models/rails_lti2_provider/tool.rb
@@ -4,7 +4,7 @@ module RailsLti2Provider
   class Tool < ApplicationRecord
     validates :shared_secret, :uuid, :tool_settings, :lti_version, presence: true
     serialize :tool_settings
-    belongs_to :tenant, inverse_of: :tools
+    belongs_to :tenant, foreign_key: :tenant_id, inverse_of: :tools
     has_many :lti_launches, dependent: :restrict_with_exception
     has_many :registrations, dependent: :restrict_with_exception