diff --git a/nifty/minimization/conjugate_gradient.py b/nifty/minimization/conjugate_gradient.py
index e18e9b1945cdf65463247064dcc1a0b1f149a831..6891087130f9a24799da30f91788e6c1c5c67e94 100644
--- a/nifty/minimization/conjugate_gradient.py
+++ b/nifty/minimization/conjugate_gradient.py
@@ -91,7 +91,7 @@ class ConjugateGradient(Loggable, object):
                 Latest convergence level indicating whether the minimization
                 has converged or not.
 
-            """
+        """
         r = b - A(x0)
         d = self.preconditioner(r)
         previous_gamma = r.dot(d)