diff --git a/Gemfile.lock b/Gemfile.lock
index aea2a72e..bf78b58b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -252,7 +252,8 @@ GEM
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2021.0225)
-    mimemagic (0.3.6)
+    mimemagic (0.3.8)
+      nokogiri (~> 1)
     mini_mime (1.0.2)
     mini_portile2 (2.5.0)
     minitest (5.14.4)
diff --git a/app/indexers/identity_metadata_indexer.rb b/app/indexers/identity_metadata_indexer.rb
index 1c8a2166..d34df418 100644
--- a/app/indexers/identity_metadata_indexer.rb
+++ b/app/indexers/identity_metadata_indexer.rb
@@ -33,7 +33,7 @@ def source_id_value
   end
 
   def barcode
-    @barcode ||= cocina_object.identification.barcode
+    @barcode ||= object_type != 'collection' ? cocina_object.identification.barcode : nil
   end
 
   def catkey
diff --git a/spec/indexers/identity_metadata_indexer_spec.rb b/spec/indexers/identity_metadata_indexer_spec.rb
index caffb5a2..7121ce36 100644
--- a/spec/indexers/identity_metadata_indexer_spec.rb
+++ b/spec/indexers/identity_metadata_indexer_spec.rb
@@ -74,5 +74,32 @@
         )
       end
     end
+
+    context 'with a collection' do
+      let(:type) { Cocina::Models::Vocab.collection }
+      let(:identification) do
+        {
+          sourceId: 'google:STANFORD_342837261527',
+          catalogLinks: [
+            {
+              catalog: 'symphony',
+              catalogRecordId: '129483625'
+            }
+          ]
+        }
+      end
+
+      it 'has the fields used by argo' do
+        expect(doc).to include(
+                         'barcode_id_ssim' => [],
+                         'catkey_id_ssim' => ['129483625'],
+                         'dor_id_tesim' => %w[STANFORD_342837261527 129483625],
+                         'identifier_ssim' => ['google:STANFORD_342837261527', 'catkey:129483625'],
+                         'identifier_tesim' => ['google:STANFORD_342837261527', 'catkey:129483625'],
+                         'objectType_ssim' => ['collection'],
+                         'source_id_ssim' => ['google:STANFORD_342837261527']
+                       )
+      end
+    end
   end
 end