diff --git a/lxd-migrate/scripts/upgrade-bridge b/lxd-migrate/scripts/upgrade-bridge
index 065ea045f..f4d28a9a7 100755
--- a/lxd-migrate/scripts/upgrade-bridge
+++ b/lxd-migrate/scripts/upgrade-bridge
@@ -1,4 +1,5 @@
-#!/bin/sh -e
+#!/bin/sh
+set -e
 # Work from the snap
 export PATH=/snap/bin/:${PATH}
 export LANG=C.UTF-8
diff --git a/snapcraft/hooks/configure b/snapcraft/hooks/configure
index c9ab24644..685ec3278 100755
--- a/snapcraft/hooks/configure
+++ b/snapcraft/hooks/configure
@@ -1,4 +1,5 @@
-#!/bin/sh -eu
+#!/bin/sh
+set -eu
 
 # Re-exec outside of apparmor confinement
 if [ -d /sys/kernel/security/apparmor ] && [ "$(cat /proc/self/attr/current)" != "unconfined" ]; then
@@ -29,19 +30,6 @@ get_bool() {
     return
 }
 
-verify_int () {
-    value="${1:-}"
-
-    # Verify if the value is a positive integer
-    if echo "${value}" | grep -Eq '^[0-9]+$'; then
-        echo "${value}"
-        return
-    fi
-
-    # Invalid value (or not set)
-    return
-}
-
 # Don't fail if the mount namespace isn't properly setup yet
 if [ ! -e /run/snapd-snap.socket ]; then
     exit 0
diff --git a/snapcraft/hooks/install b/snapcraft/hooks/install
index 800c3dd84..55f17ae45 100755
--- a/snapcraft/hooks/install
+++ b/snapcraft/hooks/install
@@ -1,4 +1,5 @@
-#!/bin/sh -eu
+#!/bin/sh
+set -eu
 
 # Create paths needed by the units
 mkdir -p "${SNAP_COMMON}/lxd"