diff --git a/mne/utils/config.py b/mne/utils/config.py
index 93eb53dbf10..a817886c3f0 100644
--- a/mne/utils/config.py
+++ b/mne/utils/config.py
@@ -216,6 +216,7 @@ def set_memmap_min_size(memmap_min_size):
     "MNE_NIRS",  # mne-nirs
     "MNE_KIT2FIFF",  # mne-kit-gui
     "MNE_ICALABEL",  # mne-icalabel
+    "MNE_LSL",  # mne-lsl
 )