diff --git a/src/spikeinterface/sorters/external/kilosort4.py b/src/spikeinterface/sorters/external/kilosort4.py
index 236db8bb5b..9f7ce929c9 100644
--- a/src/spikeinterface/sorters/external/kilosort4.py
+++ b/src/spikeinterface/sorters/external/kilosort4.py
@@ -15,6 +15,7 @@ class Kilosort4Sorter(BaseSorter):
 
     sorter_name: str = "kilosort4"
     requires_locations = True
+    gpu_capability = "nvidia-optional"
 
     _default_params = {
         "nblocks": 1,