diff --git a/calibrate.py b/calibrate.py
index 64bf0bc..47d93b2 100644
--- a/calibrate.py
+++ b/calibrate.py
@@ -48,7 +48,7 @@ def main():
     while not all(calibrated):
         for i, function in enumerate(tests):
             if not calibrated[i]:
-                wheels = function(arlo, *values)
+                wheels = function(arlo, *values[i])
                 fraction = max(wheels)/min(wheels)
                 if fraction < THRESHOLD:
                     calibrated[i] = True