diff --git a/rootfs/healthcheck/healthcheck.sh b/rootfs/healthcheck/healthcheck.sh
index 622b83a..d818aca 100755
--- a/rootfs/healthcheck/healthcheck.sh
+++ b/rootfs/healthcheck/healthcheck.sh
@@ -1,4 +1,5 @@
 #!/command/with-contenv bash
+# shellcheck shell=bash
 
 #---------------------------------------------------------------------------------------------
 # Copyright (C) 2022-2023, Ramon F. Kolb (kx1t)