diff --git a/src/spikeinterface/preprocessing/silence_periods.py b/src/spikeinterface/preprocessing/silence_periods.py
index 5e410d51d5..7c518d02a0 100644
--- a/src/spikeinterface/preprocessing/silence_periods.py
+++ b/src/spikeinterface/preprocessing/silence_periods.py
@@ -100,8 +100,8 @@ def __init__(self, recording, list_periods, mode="zeros", noise_levels=None, see
         self._kwargs = dict(recording=recording,
                             list_periods=list_periods,
                             mode=mode,
-                            seed=seed,
-                            random_chunk_kwargs=random_chunk_kwargs)
+                            seed=seed)
+        self._kwargs.update(random_chunk_kwargs)
 
 
 class SilencedPeriodsRecordingSegment(BasePreprocessorSegment):