diff --git a/bilby/core/sampler/pymc3.py b/bilby/core/sampler/pymc3.py
index fc408be045e53f0f7ad5c7f9ee657860e4107919..7677dc17c5052697cf0c23c3dac3a293fc1f4ac6 100644
--- a/bilby/core/sampler/pymc3.py
+++ b/bilby/core/sampler/pymc3.py
@@ -463,7 +463,7 @@ class Pymc3(MCMCSampler):
                             else:
                                 args = {}
                         else:
-                            if step_kwargs is not None:   
+                            if step_kwargs is not None: 
                                 args = step_kwargs.get(curmethod, {})
                             else:
                                 args = {}