diff --git a/root/etc/s6-overlay/s6-rc.d/svc-selkies/run b/root/etc/s6-overlay/s6-rc.d/svc-selkies/run
index fef8dc7..15cba7d 100755
--- a/root/etc/s6-overlay/s6-rc.d/svc-selkies/run
+++ b/root/etc/s6-overlay/s6-rc.d/svc-selkies/run
@@ -55,7 +55,7 @@ if [ ! -z ${DEV_MODE+x} ]; then
     nodemon -V --ext py --exec \
       "python3" -m selkies \
       --addr="localhost" \
-      --mode="websockets" \
+      --mode="${SELKIES_MODE:-websockets}" \
       --debug="true"
 fi
 
@@ -63,4 +63,4 @@ fi
 exec s6-setuidgid abc \
   selkies \
     --addr="localhost" \
-    --mode="websockets"
+    --mode="${SELKIES_MODE:-websockets}"