diff --git a/src/ref_gather_test.c b/src/ref_gather_test.c
index 572160ce6..dd9ac3b0e 100644
--- a/src/ref_gather_test.c
+++ b/src/ref_gather_test.c
@@ -427,8 +427,8 @@ int main(int argc, char *argv[]) {
 
   { /* recycle tet brick avm */
     REF_GRID seq_grid = NULL, para_grid = NULL;
-    char seq_file[] = "ref_gather_test_seq.avm";
-    char para_file[] = "ref_gather_test_para.avm";
+    char seq_file[] = "ref_gather_test_tet_seq.avm";
+    char para_file[] = "ref_gather_test_tet_para.avm";
     RSS(ref_fixture_tet_brick_grid(&seq_grid, ref_mpi), "set up tet");
     RSS(ref_gather_by_extension(seq_grid, seq_file), "export");
     RSS(ref_part_by_extension(&para_grid, ref_mpi, seq_file), "part");
@@ -441,6 +441,23 @@ int main(int argc, char *argv[]) {
     }
   }
 
+  RXS(ref_args_find(argc, argv, "--twod", &pos), REF_NOT_FOUND, "arg search");
+  if (REF_EMPTY != pos) { /* recycle twod brick avm */
+    REF_GRID seq_grid = NULL, para_grid = NULL;
+    char seq_file[] = "ref_gather_test_twod_seq.avm";
+    char para_file[] = "ref_gather_test_twod_para.avm";
+    RSS(ref_fixture_twod_brick_grid(&seq_grid, ref_mpi, 4), "set up tet");
+    RSS(ref_gather_by_extension(seq_grid, seq_file), "export");
+    RSS(ref_part_by_extension(&para_grid, ref_mpi, seq_file), "part");
+    RSS(ref_gather_by_extension(para_grid, para_file), "gather");
+    RSS(ref_grid_free(para_grid), "free");
+    RSS(ref_grid_free(seq_grid), "free");
+    if (ref_mpi_once(ref_mpi)) {
+      REIS(0, remove(seq_file), "test clean up");
+      REIS(0, remove(para_file), "test clean up");
+    }
+  }
+
   { /* recycle tet brick lb8.ugrid */
     REF_GRID seq_grid = NULL, para_grid;
     char seq_file[] = "ref_gather_test_seq.lb8.ugrid";