diff --git a/.shellcheckrc b/.shellcheckrc
index 354e31d..e85e456 100644
--- a/.shellcheckrc
+++ b/.shellcheckrc
@@ -5,3 +5,8 @@ disable=SC1090
 # SC1091: Not following <file>
 # https://www.shellcheck.net/wiki/SC1091
 disable=SC1091
+
+# SC3043: In POSIX sh, local is undefined
+# https://www.shellcheck.net/wiki/SC3043
+# ...but dash and BusyBox ash support it.
+disable=SC3043
diff --git a/debian/salsa-ci.yml b/debian/salsa-ci.yml
index 0b58047..e17993d 100644
--- a/debian/salsa-ci.yml
+++ b/debian/salsa-ci.yml
@@ -20,5 +20,5 @@ shellcheck:
     - apt-get update
     - apt-get install -y shellcheck
     - |
-        shellcheck -s dash hook-functions $(find hooks scripts -type f) $({ find . -maxdepth 1 -type f -executable; find debian -maxdepth 1 -type f; find docs kernel -type f; } | xargs grep -l '^#!/bin/sh')
+        shellcheck hook-functions $(find hooks scripts -type f) $({ find . -maxdepth 1 -type f -executable; find debian -maxdepth 1 -type f; find docs kernel -type f; } | xargs grep -l '^#!/bin/sh')
   needs: []
diff --git a/hook-functions b/hook-functions
index 08c0364..f630004 100644
--- a/hook-functions
+++ b/hook-functions
@@ -1,4 +1,5 @@
 # -*- shell-script -*-
+# shellcheck shell=sh
 
 catenate_cpiogz() {
 	# Sanity check
diff --git a/scripts/functions b/scripts/functions
index 60f9195..3d95f04 100644
--- a/scripts/functions
+++ b/scripts/functions
@@ -1,4 +1,5 @@
 # -*- shell-script -*-
+# shellcheck shell=sh
 
 _log_msg()
 {
diff --git a/scripts/local b/scripts/local
index 8f9597f..78653af 100644
--- a/scripts/local
+++ b/scripts/local
@@ -1,4 +1,5 @@
 # Local filesystem mounting			-*- shell-script -*-
+# shellcheck shell=sh
 
 local_top()
 {
diff --git a/scripts/nfs b/scripts/nfs
index 26a969b..f7dc89f 100644
--- a/scripts/nfs
+++ b/scripts/nfs
@@ -1,4 +1,5 @@
 # NFS filesystem mounting			-*- shell-script -*-
+# shellcheck shell=sh
 
 # FIXME This needs error checking