diff --git a/tests/testthat/testReference/fnAppend_03.rds b/tests/testthat/testReference/fnAppend_03.rds
new file mode 100644
index 00000000..ed9d43ee
Binary files /dev/null and b/tests/testthat/testReference/fnAppend_03.rds differ
diff --git a/tests/testthat/test_mat2dt.R b/tests/testthat/test_mat2dt.R
index 5e2a1851..be06aa92 100644
--- a/tests/testthat/test_mat2dt.R
+++ b/tests/testthat/test_mat2dt.R
@@ -6,7 +6,7 @@ test_that("basic",{
 
     cov <- NMreadCov("testData/nonmem/xgxr032.cov")
 
-    res <- mat2dt(cov)
+    res <- mat2dt(cov,triangle="upper")
 
     
     expect_equal_to_reference(res,fileRef)