diff --git a/bilby/core/sampler/ptmcmc.py b/bilby/core/sampler/ptmcmc.py
index 92647c6cbb6276cdfcf1f26b9012d93e087dbb77..45e75bb35f93889201c2b037355c1b9da0bcedfd 100644
--- a/bilby/core/sampler/ptmcmc.py
+++ b/bilby/core/sampler/ptmcmc.py
@@ -167,7 +167,7 @@ class PTMCMCSampler(MCMCSampler):
         if self.custom_proposals is not None:
             for proposal in self.custom_proposals:
                 print('adding ' + str(proposal) + ' to proposals with weight:' +
-                       str(self.custom_proposals[proposal][1]))
+                      str(self.custom_proposals[proposal][1]))
                 sampler.addProposalToCycle(self.custom_proposals[proposal][0],
                                            self.custom_proposals[proposal][1])
         else: