diff --git a/bin/run_vega_mpi.py b/bin/run_vega_mpi.py
index 3b43202..9690990 100644
--- a/bin/run_vega_mpi.py
+++ b/bin/run_vega_mpi.py
@@ -64,15 +64,15 @@ def print_func(message):
         from vega.samplers.polychord import Polychord
 
         print_func('Running Polychord')
-        sampler = Polychord(vega.main_config['Polychord'], sampling_params, vega.log_lik)
-        sampler.run()
+        sampler = Polychord(vega.main_config['Polychord'], sampling_params)
+        sampler.run(vega.log_lik)
     elif vega.sampler == 'PocoMC':
         from vega.samplers.pocomc import PocoMC
 
         print_func('Running PocoMC')
-        sampler = PocoMC(vega.main_config['PocoMC'], sampling_params, vega.log_lik)
+        sampler = PocoMC(vega.main_config['PocoMC'], sampling_params)
         mpi_comm.barrier()
-        sampler.run()
+        sampler.run(vega.log_lik)
         mpi_comm.barrier()
 
         if cpu_rank == 0:
diff --git a/vega/samplers/pocomc.py b/vega/samplers/pocomc.py
index 7f7e137..01daf17 100644
--- a/vega/samplers/pocomc.py
+++ b/vega/samplers/pocomc.py
@@ -34,33 +34,35 @@ def get_sampler_settings(self, sampler_config, num_params, num_derived):
              for par in self.limits]
         )
 
-    def vec_log_lik(self, theta):
+    def vec_log_lik(self, theta, log_lik_func):
         params = {name: val for name, val in zip(self.names, theta)}
-        return self.log_lik(params)
+        return log_lik_func(params)
 
-    def run(self):
+    def run(self, log_lik_func):
         if self.use_mpi:
-            self._run_mpi()
+            self._run_mpi(log_lik_func)
         else:
-            self._run_multiprocessing()
+            self._run_multiprocessing(log_lik_func)
 
-    def _run_mpi(self):
+    def _run_mpi(self, log_lik_func):
         """ Run the PocoMC sampler """
         mpi_comm = MPI.COMM_WORLD
         num_mpi_threads = mpi_comm.Get_size()
         with MPIPoolExecutor(num_mpi_threads) as pool:
             self.pocomc_sampler = pocomc.Sampler(
-                self.prior, self.vec_log_lik, pool=pool, output_dir=self.path,
+                self.prior, self.vec_log_lik, likelihood_args=(log_lik_func),
+                pool=pool, output_dir=self.path,
                 dynamic=self.dynamic, precondition=self.precondition,
                 n_effective=self.n_effective, n_active=self.n_active,
             )
             self.pocomc_sampler.run(self.n_total, self.n_evidence, save_every=self.save_every)
 
-    def _run_multiprocessing(self):
+    def _run_multiprocessing(self, log_lik_func):
         """ Run the PocoMC sampler """
         with Pool(self.num_cpu) as pool:
             self.pocomc_sampler = pocomc.Sampler(
-                self.prior, self.vec_log_lik, pool=pool, output_dir=self.path,
+                self.prior, self.vec_log_lik, likelihood_args=(log_lik_func),
+                pool=pool, output_dir=self.path,
                 dynamic=self.dynamic, precondition=self.precondition,
                 n_effective=self.n_effective, n_active=self.n_active,
             )
diff --git a/vega/samplers/polychord.py b/vega/samplers/polychord.py
index 0160f99..30216e3 100644
--- a/vega/samplers/polychord.py
+++ b/vega/samplers/polychord.py
@@ -96,7 +96,7 @@ def log_lik(theta):
             for i, name in enumerate(self.names):
                 params[name] = theta[i]
 
-            log_lik = self.log_lik(params)
+            log_lik = log_lik_func(params)
             return log_lik, []
 
         def prior(hypercube):
diff --git a/vega/samplers/sampler_interface.py b/vega/samplers/sampler_interface.py
index ac98ee1..1e0817c 100644
--- a/vega/samplers/sampler_interface.py
+++ b/vega/samplers/sampler_interface.py
@@ -10,7 +10,7 @@
 class Sampler:
     ''' Interface between Vega and the nested sampler PolyChord '''
 
-    def __init__(self, sampler_config, limits, log_lik_func):
+    def __init__(self, sampler_config, limits):
         """
 
         Parameters
@@ -26,7 +26,7 @@ def __init__(self, sampler_config, limits, log_lik_func):
         self.names = list(limits.keys())
         self.num_params = len(limits)
         self.num_derived = 0
-        self.log_lik = log_lik_func
+        # self.log_lik = log_lik_func
         self.getdist_latex = sampler_config.getboolean('getdist_latex', True)
 
         # Check limits are well defined
@@ -74,5 +74,5 @@ def write_parnames(self, parnames_path):
     def get_sampler_settings(self, sampler_config, num_params, num_derived):
         raise NotImplementedError('This method should be implemented in the child class')
 
-    def run(self):
+    def run(self, log_lik_func):
         raise NotImplementedError('This method should be implemented in the child class')