diff --git a/DtoImporterService/BookImporter.cs b/DtoImporterService/BookImporter.cs
index 8d6bbd27..4fe3a70e 100644
--- a/DtoImporterService/BookImporter.cs
+++ b/DtoImporterService/BookImporter.cs
@@ -21,7 +21,7 @@ namespace DtoImporterService
 			new CategoryImporter(DbContext).Import(importItems);
 
 			// get distinct
-			var productIds = importItems.Select(i => i.DtoItem.ProductId).ToList();
+			var productIds = importItems.Select(i => i.DtoItem.ProductId);
 
 			// load db existing => .Local
 			loadLocal_books(productIds);
@@ -31,7 +31,7 @@ namespace DtoImporterService
 			return qtyNew;
 		}
 
-		private void loadLocal_books(List<string> productIds)
+		private void loadLocal_books(IEnumerable<string> productIds)
 		{
 			var localProductIds = DbContext.Books.Local.Select(b => b.AudibleProductId);
 			var remainingProductIds = productIds
diff --git a/DtoImporterService/LibraryImporter.cs b/DtoImporterService/LibraryImporter.cs
index 48e9b628..b0077145 100644
--- a/DtoImporterService/LibraryImporter.cs
+++ b/DtoImporterService/LibraryImporter.cs
@@ -34,8 +34,8 @@ namespace DtoImporterService
 			//
 			// CURRENT SOLUTION: don't re-insert
 
-			var currentLibraryProductIds = DbContext.Library.Select(l => l.Book.AudibleProductId).ToList();
-			var newItems = importItems.Where(dto => !currentLibraryProductIds.Contains(dto.DtoItem.ProductId)).ToList();
+			var currentLibraryProductIds = DbContext.Library.Select(l => l.Book.AudibleProductId);
+			var newItems = importItems.Where(dto => !currentLibraryProductIds.Contains(dto.DtoItem.ProductId));
 
 			foreach (var newItem in newItems)
 			{
@@ -55,7 +55,7 @@ namespace DtoImporterService
 					u.UpdateAccount(item.AccountId);
 			}
 
-			var qtyNew = newItems.Count;
+			var qtyNew = newItems.Count();
 			return qtyNew;
 		}
 	}