diff --git a/src/spikeinterface/core/core_tools.py b/src/spikeinterface/core/core_tools.py
index 4cd902eff9..1f2e644be6 100644
--- a/src/spikeinterface/core/core_tools.py
+++ b/src/spikeinterface/core/core_tools.py
@@ -101,7 +101,7 @@ def default(self, obj):
 
         if isinstance(obj, Path):
             return str(obj)
-          
+
         if isinstance(obj, Motion):
             return obj.to_dict()