diff --git a/paramtools/tests/test_parameters.py b/paramtools/tests/test_parameters.py
index 6a25693..1c5a6ec 100644
--- a/paramtools/tests/test_parameters.py
+++ b/paramtools/tests/test_parameters.py
@@ -1047,7 +1047,7 @@ def test_range_validation_on_list_param(self, TestParams):
             ]
         }
         params.adjust(adj, raise_errors=False)
-        exp = ["float_list_param[label0=zero, label1=1] [-1.0, 1.0] < min 0 "]
+        exp = ["float_list_param[label0=zero, label1=1] [np.float64(-1.0), np.float64(1.0)] < min 0 "]
 
         assert params.errors["float_list_param"] == exp