diff --git a/pkg.info b/pkg.info
index a96d08c..549d956 100644
--- a/pkg.info
+++ b/pkg.info
@@ -1,7 +1,7 @@
 name: dash
 description: POSIX-compliant implementation of /bin/sh that aims to be as small as possible
 version: 0.5.13.2
-revision: 1
+revision: 2
 url: http://gondor.apana.org.au/~herbert/dash/
 license: BSD-3-Clause
 maintainers:
diff --git a/post_install.sh b/post_install.sh
index 5552fe9..794ec7b 100644
--- a/post_install.sh
+++ b/post_install.sh
@@ -1,7 +1,10 @@
 #!/bin/sh
 
-SHELL="/bin/dash"
+SHELLS="/bin/dash /usr/bin/dash"
 
-if ! grep "${SHELL}" "$BPM_ROOT"/etc/shells; then
-  echo "${SHELL}" | tee -a "$BPM_ROOT"/etc/shells
-fi
+for _shell in $SHELLS; do
+  if ! grep -q "^${_shell}\$" /etc/shells; then
+    echo "Adding '$_shell' to /etc/shells..."
+    echo "$_shell" | tee -a /etc/shells 1>/dev/null
+  fi
+done
diff --git a/post_remove.sh b/post_remove.sh
index 01d886c..e71f1e2 100644
--- a/post_remove.sh
+++ b/post_remove.sh
@@ -1,7 +1,10 @@
 #!/bin/sh
 
-SHELL="/bin/dash"
+SHELLS="/bin/dash /usr/bin/dash"
 
-if grep "${SHELL}" "$BPM_ROOT"/etc/shells; then
-  sed -i "\|${SHELL}|d" "$BPM_ROOT"/etc/shells
-fi
+for _shell in $SHELLS; do
+  if grep -q "^${_shell}\$" /etc/shells; then
+    echo "Removing '$_shell' from /etc/shells..."
+    sed -i "\|^${_shell}\$|d" /etc/shells
+  fi
+done
diff --git a/post_update.sh b/post_update.sh
new file mode 100644
index 0000000..794ec7b
--- /dev/null
+++ b/post_update.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+SHELLS="/bin/dash /usr/bin/dash"
+
+for _shell in $SHELLS; do
+  if ! grep -q "^${_shell}\$" /etc/shells; then
+    echo "Adding '$_shell' to /etc/shells..."
+    echo "$_shell" | tee -a /etc/shells 1>/dev/null
+  fi
+done