diff --git a/src/lvs/unit_tests/lvsTests.cc b/src/lvs/unit_tests/lvsTests.cc
index f4938f530..56fb41d96 100644
--- a/src/lvs/unit_tests/lvsTests.cc
+++ b/src/lvs/unit_tests/lvsTests.cc
@@ -167,3 +167,9 @@ TEST(19_private)
   run_test (_this, "test_19.lvs", "test_19.cir.gz", "test_19.gds.gz", true);
 }
 
+TEST(20_private)
+{
+  // test_is_long_runner ();
+  run_test (_this, "test_20.lylvs", "test_20.cir.gz", "test_20.gds.gz", true, "test_20.lvsdb");
+}
+