diff --git a/gradientCalculation.py b/gradientCalculation.py
index b97d198..c5ff81f 100644
--- a/gradientCalculation.py
+++ b/gradientCalculation.py
@@ -150,7 +150,7 @@ def generateCoil(designParameters, **kwargs):
     nrWires = designParameters['nrWires']
     wires = calculateContour(streamFun, lengthTerm, nrWires)
 
-    wireDiameter = kwargs.get('wireDiameter', 1.5e-3)  # metre
+    wireDiameter = designParameters['wireDiameter']  # metre
     wireLength = calculateWireLength(wires, currRadius)
     resistance = calculateResistance(wireLength, wireDiameter)
     if INFO: