diff --git a/app/models/customer.rb b/app/models/customer.rb
index 45dafaf..eb05f0b 100644
--- a/app/models/customer.rb
+++ b/app/models/customer.rb
@@ -106,7 +106,7 @@ class Customer < ActiveRecord::Base
     last = Qbo.first.last_sync
     
     query = "Select Id, DisplayName From Customer"
-    query << " Where Metadata.LastUpdatedTime >= '#{1.week.ago}' " if last
+    query << " Where Metadata.LastUpdatedTime >= '#{last.iso8601}' " if last
     query << " Order By DisplayName "
     
     customers = Qbo.get_base(:customer).service.query_in_batches(query, per_page: 100) do |batch|