diff --git a/tests/distributions/test_continuous.py b/tests/distributions/test_continuous.py
index e68de7732b..73ab07d3c1 100644
--- a/tests/distributions/test_continuous.py
+++ b/tests/distributions/test_continuous.py
@@ -592,7 +592,7 @@ def test_skewstudentt_logcdf(self):
         check_logcdf(
             pm.SkewStudentT,
             R,
-            {"a": Rplus, "b": Rplus, "mu": R, "sigma": Rplus},
+            {"a": Rplus, "b": Rplus, "mu": R, "sigma": Rplusbig},
             lambda value, a, b, mu, sigma: st.jf_skew_t.logcdf(value, a, b, mu, sigma),
         )