diff --git a/Models/Repositories/PhSCustomerRepository.cs b/Models/Repositories/PhSCustomerRepository.cs
index 6681c93..64607d0 100644
--- a/Models/Repositories/PhSCustomerRepository.cs
+++ b/Models/Repositories/PhSCustomerRepository.cs
@@ -51,8 +51,9 @@ namespace Models.Repositories
 
             if (!string.IsNullOrWhiteSpace(document))
             {
-                query = query.Where(c => c.PhSCustomerDocuments.Any(d => d.DocumentNumber.Contains(document)));
-            }
+                query = query.Where(c =>
+                    c.PhSCustomerDocuments.Any(a =>
+                        a.DocumentNumber.ToLower().Contains(document)));            }
 
             if (!string.IsNullOrWhiteSpace(email))
             {