diff --git a/hx711.py b/hx711.py
index 296b913..f42a74e 100644
--- a/hx711.py
+++ b/hx711.py
@@ -220,8 +220,8 @@ def read_median(self, times=3):
        else:
           # If times is even we have to take the arithmetic mean of
           # the two middle values.
-          midpoint = len(valueList) / 2
-          return sum(valueList[midpoint:midpoint+2]) / 2.0
+          midpoint = int(len(valueList) / 2)
+          return sum(valueList[midpoint-1:midpoint+1]) / 2.0
 
 
     # Compatibility function, uses channel A version