diff --git a/imagine/observers/hammurapy/hammurapy.py b/imagine/observers/hammurapy/hammurapy.py
index 11b0c982667c1314c2916010213ffbaa31fb1855..137939e7548d2c67552f8f5686b4eddb0bb0c03e 100644
--- a/imagine/observers/hammurapy/hammurapy.py
+++ b/imagine/observers/hammurapy/hammurapy.py
@@ -129,7 +129,7 @@ class Hammurapy(Observer):
         # know that the distribution strategy is the same for the
         # randam samples and the magnetic field itself
         random_seed = magnetic_field.random_seed.data[local_ensemble_index]
-        custom_parameters += [['./Galaxy/MagneticField/Random', 'seed',
+        custom_parameters += [['./MagneticField/Random', 'seed',
                                random_seed]]
 
         for key, value in magnetic_field.parameters.iteritems():