diff --git a/src/rail/estimation/algos/point_est_hist.py b/src/rail/estimation/algos/point_est_hist.py
index 99fd3e6b..c20270f7 100644
--- a/src/rail/estimation/algos/point_est_hist.py
+++ b/src/rail/estimation/algos/point_est_hist.py
@@ -37,7 +37,7 @@ class PointEstHistSummarizer(PZSummarizer):
                           seed=Param(int, 87, msg="random seed"),
                           point_estimate=Param(str, 'zmode', msg="Which point estimate to use"),
                           nsamples=Param(int, 1000, msg="Number of sample distributions to return"))
-    input = [('input', QPHandle)]
+    inputs = [('input', QPHandle)]
     outputs = [('output', QPHandle),
                ('single_NZ', QPHandle)]