diff --git a/demos/bernoulli_demo.py b/demos/bernoulli_demo.py
index 2c2d79f633bfd00e370316010d0fdcbd23a0e5cc..9d042e54373f3129cd2a005e178c074aa1bb1371 100644
--- a/demos/bernoulli_demo.py
+++ b/demos/bernoulli_demo.py
@@ -64,7 +64,7 @@ if __name__ == '__main__':
 
     # Minimize the Hamiltonian
     H = ift.Hamiltonian(likelihood, ic_sampling)
-    H = H.makeInvertible(ic_cg)
+    H = H.make_invertible(ic_cg)
     # minimizer = ift.SteepestDescent(ic_newton)
     H, convergence = minimizer(H)
 
diff --git a/demos/getting_started_2.py b/demos/getting_started_2.py
index 9a2f13ac8db9603243a3874dcfd5ac98a59a6a2c..e53c81fcd1cc247a0e02c29213bb0143184e714d 100644
--- a/demos/getting_started_2.py
+++ b/demos/getting_started_2.py
@@ -80,7 +80,7 @@ if __name__ == '__main__':
 
     # Minimize the Hamiltonian
     H = ift.Hamiltonian(likelihood)
-    H = H.makeInvertible(ic_cg)
+    H = H.make_invertible(ic_cg)
     H, convergence = minimizer(H)
 
     # Plot results
diff --git a/demos/getting_started_3.py b/demos/getting_started_3.py
index 2ecc30574a77cad865698d6c4949e69657d5ae82..b7bd3752cd4055f2931d3cbb8dec113f5d77a765 100644
--- a/demos/getting_started_3.py
+++ b/demos/getting_started_3.py
@@ -77,7 +77,7 @@ if __name__ == '__main__':
                    for _ in range(N_samples)]
 
         KL = ift.SampledKullbachLeiblerDivergence(H, samples)
-        KL = KL.makeInvertible(ic_cg)
+        KL = KL.make_invertible(ic_cg)
         KL, convergence = minimizer(KL)
         position = KL.position
 
diff --git a/nifty5/minimization/energy.py b/nifty5/minimization/energy.py
index f567a0e38cee4f29dc51f2141d2bf2de7b5ce268..58d757cdb625bf1f3291b2595f4f7295b3bc6f66 100644
--- a/nifty5/minimization/energy.py
+++ b/nifty5/minimization/energy.py
@@ -130,7 +130,7 @@ class Energy(NiftyMetaBase()):
         """
         return None
 
-    def makeInvertible(self, controller, preconditioner=None):
+    def make_invertible(self, controller, preconditioner=None):
         from .iteration_controller import IterationController
         if not isinstance(controller, IterationController):
             raise TypeError