diff --git a/tests/testthat/test-fit.R b/tests/testthat/test-fit.R
index 46eb0e145..3547a4a81 100644
--- a/tests/testthat/test-fit.R
+++ b/tests/testthat/test-fit.R
@@ -1063,3 +1063,11 @@ test_that("mmrm validates contrasts argument", {
     "list"
   )
 })
+
+test_that("mmrm works for vignette model fit (this seems to be an issue with old openBLAS)", {
+  fit <- expect_silent(mmrm(
+    formula = FEV1 ~ RACE + SEX + ARMCD * AVISIT + us(AVISIT | USUBJID),
+    data = fev_data
+  ))
+  expect_true(attr(fit, "converged"))
+})