diff --git a/lib/s3_inventory.rb b/lib/s3_inventory.rb
index 05096f0a30..8acb9b2051 100644
--- a/lib/s3_inventory.rb
+++ b/lib/s3_inventory.rb
@@ -5,7 +5,7 @@ require "csv"
 
 class S3Inventory
 
-  attr_reader :inventory_id, :model, :last_modified
+  attr_reader :inventory_id, :model, :inventory_date
 
   CSV_KEY_INDEX ||= 1
   CSV_ETAG_INDEX ||= 2
@@ -53,7 +53,7 @@ class S3Inventory
           end
         end
 
-        uploads = (model == Upload) ? model.where("created_at < ?", last_modified) : model
+        uploads = (model == Upload) ? model.where("created_at < ?", inventory_date) : model
         missing_uploads = uploads.joins("LEFT JOIN #{table_name} ON #{table_name}.etag = #{model.table_name}.etag").where("#{table_name}.etag is NULL")
 
         if (missing_count = missing_uploads.count) > 0
@@ -129,7 +129,7 @@ class S3Inventory
       symlink_file = unsorted_files.sort_by { |file| -file.last_modified.to_i }.first
       return [] if symlink_file.blank?
 
-      @last_modified = symlink_file.last_modified
+      @inventory_date = symlink_file.last_modified - 1.day
       log "Downloading symlink file to tmp directory..."
       failure_message = "Failed to download symlink file to tmp directory."
       filename = File.join(tmp_directory, File.basename(symlink_file.key))
diff --git a/spec/components/s3_inventory_spec.rb b/spec/components/s3_inventory_spec.rb
index 617101eef4..26e7772581 100644
--- a/spec/components/s3_inventory_spec.rb
+++ b/spec/components/s3_inventory_spec.rb
@@ -66,8 +66,8 @@ describe "S3Inventory" do
 
     inventory.expects(:download_inventory_files_to_tmp_directory)
     inventory.expects(:decompress_inventory_files)
-    inventory.expects(:files).returns([{ key: "Key", filename: "#{csv_filename}.gz" }]).at_least(1)
-    inventory.expects(:last_modified).returns(Time.now)
+    inventory.expects(:files).returns([{ key: "Key", filename: "#{csv_filename}.gz" }]).times(2)
+    inventory.expects(:inventory_date).returns(Time.now)
 
     output = capture_stdout do
       inventory.list_missing
@@ -81,7 +81,7 @@ describe "S3Inventory" do
 
     inventory.expects(:download_inventory_files_to_tmp_directory)
     inventory.expects(:decompress_inventory_files)
-    inventory.expects(:files).returns([{ key: "Key", filename: "#{csv_filename}.gz" }]).at_least(1)
+    inventory.expects(:files).returns([{ key: "Key", filename: "#{csv_filename}.gz" }]).times(2)
 
     output = capture_stdout do
       expect { inventory.list_missing(backfill_etags: true) }.to change { Upload.where(etag: nil).count }.by(-1)