diff --git a/ppi_py/ppi.py b/ppi_py/ppi.py
index 380c019..63f85a7 100644
--- a/ppi_py/ppi.py
+++ b/ppi_py/ppi.py
@@ -179,6 +179,7 @@ def ppi_mean_ci(
             Y,
             Yhat,
             Yhat_unlabeled,
+            alpha=alpha,
             lhat=lhat,
             coord=coord,
             w=w,