diff --git a/app/models/sponsorship.rb b/app/models/sponsorship.rb
index c8c5e92a5..337f47e9e 100644
--- a/app/models/sponsorship.rb
+++ b/app/models/sponsorship.rb
@@ -2,6 +2,7 @@ class Sponsorship < ApplicationRecord
   LEVELS = %w[gold silver bronze tag media devrel].freeze
   METAL_LEVELS = %w[gold silver bronze].freeze
   STATUSES = %w[none pending live].freeze
+  SPONSORABLE_TYPES = %w[Tag ActsAsTaggableOn::Tag].freeze
   # media has no fixed amount of credits
   CREDITS = {
     gold: 6_000,
@@ -19,6 +20,11 @@ class Sponsorship < ApplicationRecord
   validates :status, presence: true, inclusion: { in: STATUSES }
   validates :url, url: { allow_blank: true, no_local: true, schemes: %w[http https] }
   validates :user, :organization, :featured_number, presence: true
+  validates :sponsorable_type, inclusion: {
+    in: SPONSORABLE_TYPES,
+    allow_blank: true,
+    message: "is not a sponsorable type"
+  }
 
   validate :validate_tag_uniqueness, if: proc { level.to_s == "tag" }
   validate :validate_level_uniqueness, if: proc { METAL_LEVELS.include?(level) }
diff --git a/spec/models/sponsorship_spec.rb b/spec/models/sponsorship_spec.rb
index d72c20f7f..71eae0a39 100644
--- a/spec/models/sponsorship_spec.rb
+++ b/spec/models/sponsorship_spec.rb
@@ -111,6 +111,12 @@ RSpec.describe Sponsorship, type: :model do
         expect(tag_sponsorship).not_to be_valid
         expect(tag_sponsorship.errors[:level]).to be_present
       end
+
+      it "ensures sponsorable_type is loadable when present" do
+        sponsorship = build(:sponsorship, user: user, organization: org, sponsorable_type: "Unsponsorable")
+        expect(sponsorship).not_to be_valid
+        expect(sponsorship.errors[:sponsorable_type]).to include("is not a sponsorable type")
+      end
     end
   end
 end