diff --git a/src/spikeinterface/preprocessing/filter.py b/src/spikeinterface/preprocessing/filter.py
index eb1efa5700..e66797f93e 100644
--- a/src/spikeinterface/preprocessing/filter.py
+++ b/src/spikeinterface/preprocessing/filter.py
@@ -333,7 +333,7 @@ def __init__(self, recording, freq=3000, q=30, margin_ms=5.0, dtype=None):
         self._kwargs = dict(recording=recording, freq=freq, q=q, margin_ms=margin_ms, dtype=dtype.str)
 
 
-class Causal_filter(FilterRecording):
+class CausalFilter(FilterRecording):
     """
     Performs causal filtering using:
         * scipy.signal.lfilt or scipy.signal.sosfilt