diff --git a/nmostesting/suites/MS0501Test.py b/nmostesting/suites/MS0501Test.py
index bf9d3b70..158c900a 100644
--- a/nmostesting/suites/MS0501Test.py
+++ b/nmostesting/suites/MS0501Test.py
@@ -1810,7 +1810,7 @@ def _generate_number_parameters(self, constraints_, violate_constraints=False):
         maximum = (constraints.maximum or sys.maxsize if constraints else sys.maxsize)
         step = (constraints.step or 1 if constraints else 1)
 
-        valid_value = floor((((maximum - minimum) / 2) + minimum) / step) * step + minimum
+        valid_value = floor(((maximum - minimum) / 2) / step) * step + minimum
 
         # Valid value
         if not violate_constraints: