diff --git a/maths/newton_raphson.py b/maths/newton_raphson.py
index cc6c92734..d89f264ac 100644
--- a/maths/newton_raphson.py
+++ b/maths/newton_raphson.py
@@ -29,7 +29,6 @@ def newton_raphson(f, x0=0, maxiter=100, step=0.0001, maxerror=1e-6,logsteps=Fal
         a = a - f(a)/f1(a) #Calculate the next estimate
         if logsteps:
             steps.append(a)
-        error = abs(f(a))
         if error < maxerror:
             break
     else: