diff --git a/src/NPoco.SqlServer/SqlBulkCopyHelper.cs b/src/NPoco.SqlServer/SqlBulkCopyHelper.cs
index 3f55fa1a93effe781d1ba7ba976ac8b73e44172d..d489c75a95cb8e60e01769fb8af69c52181ee4ce 100644
--- a/src/NPoco.SqlServer/SqlBulkCopyHelper.cs
+++ b/src/NPoco.SqlServer/SqlBulkCopyHelper.cs
@@ -70,8 +70,8 @@ private static DataTable BuildBulkInsertDataTable<T>(IDatabase db, IEnumerable<T
 
             foreach (var col in cols)
             {
-                bulkCopy.ColumnMappings.Add(col.Value.MemberInfoData.Name, col.Value.ColumnName);
-                table.Columns.Add(col.Value.MemberInfoData.Name, Nullable.GetUnderlyingType(col.Value.MemberInfoData.MemberType) ?? col.Value.MemberInfoData.MemberType);
+                bulkCopy.ColumnMappings.Add(col.Value.MemberInfoKey, col.Value.ColumnName);
+                table.Columns.Add(col.Value.MemberInfoKey, Nullable.GetUnderlyingType(col.Value.MemberInfoData.MemberType) ?? col.Value.MemberInfoData.MemberType);
             }
 
             foreach (var item in list)