diff --git a/script/Averager.py b/script/Averager.py
index 1cf7da2..e922b98 100644
--- a/script/Averager.py
+++ b/script/Averager.py
@@ -14,7 +14,7 @@ class Averager(ReadonlyRegisterBase):
         self.devices = devices
         self.integration_time = integration_time
         self.initialize()
-        self.samples = [[],] * len[devices]
+        self.samples = [[],] * len(devices)
                         
     def doRead(self):  
         start = time.time()