diff --git a/openquake/mbt/tools/mfd_sample/make_mfds.py b/openquake/mbt/tools/mfd_sample/make_mfds.py
index cabca33d5..1c0427910 100644
--- a/openquake/mbt/tools/mfd_sample/make_mfds.py
+++ b/openquake/mbt/tools/mfd_sample/make_mfds.py
@@ -119,7 +119,7 @@ def _create_catalogue_versions(catfi, outdir, numcats=None, stype='random',
 
 
 
-def _decl_all_cats(outdir, cat, dcl_toml_tmp, decdir):
+def _decl_all_cats(outdir, dcl_toml_tmp, decdir):
 
     """
     """
@@ -241,7 +241,7 @@ def make_many_mfds(configfile, basedir=None):
     decluster = config['decluster'].get('decluster_catalogues', True)
     if decluster:
         dcl_toml_tmpl = config['decluster']['decluster_settings']
-        _decl_all_cats(catdir, catfi, dcl_toml_tmpl, decdir)
+        _decl_all_cats(catdir, dcl_toml_tmpl, decdir)
 
 
     # generate the completeness tables 
diff --git a/openquake/mbt/tools/model_building/dclustering.py b/openquake/mbt/tools/model_building/dclustering.py
index 31ce24b0a..e530c2cd4 100755
--- a/openquake/mbt/tools/model_building/dclustering.py
+++ b/openquake/mbt/tools/model_building/dclustering.py
@@ -78,8 +78,6 @@ def decluster(catalogue_hmtk_fname, declustering_meth, declustering_params,
         It can be a string or a list of strings
     :param str tr_fname:
         An .hdf5 file containing the TR classification of the catalogue
-    :param array mag_perm:
-        An array the length of the cat that will replaces the magnitudes 
     :param bool subcatalogues:
         When true creates subcatalogues per tectonic region
     :param str fmat: