diff --git a/lib/iiif_manifest/v3/manifest_builder/content_builder.rb b/lib/iiif_manifest/v3/manifest_builder/content_builder.rb
index 2be7db9..75d5357 100644
--- a/lib/iiif_manifest/v3/manifest_builder/content_builder.rb
+++ b/lib/iiif_manifest/v3/manifest_builder/content_builder.rb
@@ -11,11 +11,12 @@ def initialize(display_content, iiif_annotation_factory:, body_builder_factory:)
         end
 
         def apply(canvas)
+          # Assume first item in canvas is an annotation page
+          annotation['id'] = "#{canvas.items.first['id']}/annotation/#{annotation.index}"
           annotation['target'] = canvas['id']
           canvas['width'] = annotation.body['width'] if annotation.body['width'].present?
           canvas['height'] = annotation.body['height'] if annotation.body['height'].present?
           canvas['duration'] = annotation.body['duration'] if annotation.body['duration'].present?
-          # Assume first item in canvas is an annotation page
           canvas.items.first.items += [annotation]
         end
 
diff --git a/lib/iiif_manifest/v3/manifest_builder/iiif_service.rb b/lib/iiif_manifest/v3/manifest_builder/iiif_service.rb
index 61ecb79..d4885f5 100644
--- a/lib/iiif_manifest/v3/manifest_builder/iiif_service.rb
+++ b/lib/iiif_manifest/v3/manifest_builder/iiif_service.rb
@@ -191,6 +191,10 @@ def body
             inner_hash['body']
           end
 
+          def index
+            @index ||= SecureRandom.uuid
+          end
+
           def initial_attributes
             {
               'type' => 'Annotation',
diff --git a/spec/lib/iiif_manifest/v3/manifest_factory_spec.rb b/spec/lib/iiif_manifest/v3/manifest_factory_spec.rb
index 8bb1fd1..5ae6a0f 100644
--- a/spec/lib/iiif_manifest/v3/manifest_factory_spec.rb
+++ b/spec/lib/iiif_manifest/v3/manifest_factory_spec.rb
@@ -142,6 +142,7 @@ def display_content
         expect(result['items'].first['items'].first['id']).not_to be_empty
         expect(result['items'].first['items'].first['items'].length).to eq 1
         expect(result['items'].first['items'].first['items'].first['type']).to eq 'Annotation'
+        expect(result['items'].first['items'].first['items'].first['id']).not_to be_empty
         expect(result['items'].first['items'].first['items'].first['motivation']).to eq 'painting'
         expect(result['items'].first['items'].first['items'].first['target']).to eq result['items'].first['id']
         expect(result['items'].first['items'].first['items'].first['body']['type']).to eq 'Image'
@@ -185,6 +186,7 @@ def display_content
           expect(result['items'].first['items'].first['id']).not_to be_empty
           expect(result['items'].first['items'].first['items'].length).to eq 1
           expect(result['items'].first['items'].first['items'].first['type']).to eq 'Annotation'
+          expect(result['items'].first['items'].first['items'].first['id']).not_to be_empty
           expect(result['items'].first['items'].first['items'].first['motivation']).to eq 'painting'
           expect(result['items'].first['items'].first['items'].first['target']).to eq result['items'].first['id']
           expect(result['items'].first['items'].first['items'].first['body']['type']).to eq 'Sound'