diff --git a/spikeinterface/extractors/neoextractors/neobaseextractor.py b/spikeinterface/extractors/neoextractors/neobaseextractor.py
index 1186e05394..4d023a45c9 100644
--- a/spikeinterface/extractors/neoextractors/neobaseextractor.py
+++ b/spikeinterface/extractors/neoextractors/neobaseextractor.py
@@ -1,3 +1,5 @@
+import warnings
+
 import numpy as np
 from spikeinterface.core import (BaseRecording, BaseSorting, BaseEvent,
                                  BaseRecordingSegment, BaseSortingSegment, BaseEventSegment)
@@ -64,8 +66,9 @@ def __init__(self, stream_id=None, all_annotations=False, **neo_kwargs):
         units = signal_channels['units']
         if not np.all(np.isin(units, ['V', 'Volt', 'mV', 'uV'])):
             # check that units are V, mV or uV
-            error = f'This extractor based on  neo.{self.NeoRawIOClass} have strange units not in (V, mV, uV) {units}'
-            print(error)
+            message = f'This extractor based on  neo.{self.NeoRawIOClass} have strange units not in (V, mV, uV) {units}'
+            warnings.warn(message)
+        
         additional_gain = np.ones(units.size, dtype='float')
         additional_gain[units == 'V'] = 1e6
         additional_gain[units == 'Volt'] = 1e6