diff --git a/src/unit_tests/dbCIFReader.cc b/src/unit_tests/dbCIFReader.cc
index 051c65c03..129617cfb 100644
--- a/src/unit_tests/dbCIFReader.cc
+++ b/src/unit_tests/dbCIFReader.cc
@@ -128,12 +128,12 @@ static void run_test (ut::TestBase *_this, const char *file, const char *file_au
     reader.read (layout_au);
   }
 
-  bool equal = db::compare_layouts (layout2, layout_au, db::layout_diff::f_boxes_as_polygons | db::layout_diff::f_verbose | db::layout_diff::f_flatten_array_insts, 0);
+  bool equal = db::compare_layouts (layout2, layout_au, db::layout_diff::f_boxes_as_polygons | db::layout_diff::f_verbose | db::layout_diff::f_flatten_array_insts, 1);
   if (! equal) {
     _this->raise (tl::sprintf ("Compare failed after reading - see %s vs %s\n", tmp_gds_file, file_au));
   }
 
-  equal = db::compare_layouts (layout, layout2_cif, db::layout_diff::f_boxes_as_polygons | db::layout_diff::f_verbose | db::layout_diff::f_flatten_array_insts, 0);
+  equal = db::compare_layouts (layout, layout2_cif, db::layout_diff::f_boxes_as_polygons | db::layout_diff::f_verbose | db::layout_diff::f_flatten_array_insts, 1);
   if (! equal) {
     _this->raise (tl::sprintf ("Compare failed after writing - see %s vs %s\n", file, tmp_cif_file));
   }
diff --git a/src/unit_tests/dbDXFReader.cc b/src/unit_tests/dbDXFReader.cc
index ba19ae868..4feff8080 100644
--- a/src/unit_tests/dbDXFReader.cc
+++ b/src/unit_tests/dbDXFReader.cc
@@ -67,7 +67,7 @@ static void run_test (ut::TestBase *_this, const char *file, const char *file_au
     reader.read (layout, options);
   }
 
-  _this->compare_layouts (layout, ut::testsrc_private () + std::string ("/testdata/dxf/") + file_au);
+  _this->compare_layouts (layout, ut::testsrc_private () + std::string ("/testdata/dxf/") + file_au, ut::WriteGDS2, 1);
 }
 
 TEST(1a)
diff --git a/src/unit_tests/extGerberImport.cc b/src/unit_tests/extGerberImport.cc
index 0e05a3dab..49d7ddb36 100644
--- a/src/unit_tests/extGerberImport.cc
+++ b/src/unit_tests/extGerberImport.cc
@@ -47,7 +47,7 @@ static void run_test (ut::TestBase *_this, const char *dir)
     reader.read (layout, options);
   }
 
-  _this->compare_layouts (layout, ut::testsrc_private () + "/testdata/pcb/" + dir + "/au.oas.gz", ut::WriteOAS);
+  _this->compare_layouts (layout, ut::testsrc_private () + "/testdata/pcb/" + dir + "/au.oas.gz", ut::WriteOAS, 1);
 }
 
 TEST(1)