diff --git a/src/Umbraco.Infrastructure/Search/ExamineComposer.cs b/src/Umbraco.Infrastructure/Search/ExamineComposer.cs
index c961aa6e72..7fde24d069 100644
--- a/src/Umbraco.Infrastructure/Search/ExamineComposer.cs
+++ b/src/Umbraco.Infrastructure/Search/ExamineComposer.cs
@@ -1,6 +1,6 @@
 using Microsoft.Extensions.DependencyInjection;
-using Umbraco.Core.DependencyInjection;
 using Umbraco.Core.Composing;
+using Umbraco.Core.DependencyInjection;
 using Umbraco.Core.Models;
 using Umbraco.Core.PropertyEditors;
 using Umbraco.Core.Scoping;
@@ -22,10 +22,10 @@ namespace Umbraco.Web.Search
 
             // populators are not a collection: one cannot remove ours, and can only add more
             // the container can inject IEnumerable<IIndexPopulator> and get them all
-            builder.Services.AddSingleton<MemberIndexPopulator>();
-            builder.Services.AddSingleton<ContentIndexPopulator>();
-            builder.Services.AddSingleton<PublishedContentIndexPopulator>();
-            builder.Services.AddSingleton<MediaIndexPopulator>();
+            builder.Services.AddSingleton<IIndexPopulator, MemberIndexPopulator>();
+            builder.Services.AddSingleton<IIndexPopulator, ContentIndexPopulator>();
+            builder.Services.AddSingleton<IIndexPopulator, PublishedContentIndexPopulator>();
+            builder.Services.AddSingleton<IIndexPopulator, MediaIndexPopulator>();
 
             builder.Services.AddSingleton<IndexRebuilder>();
             builder.Services.AddUnique<IUmbracoIndexConfig, UmbracoIndexConfig>();