diff --git a/config/common.mk b/config/common.mk
index 0833b9a3..1d91d6cf 100644
--- a/config/common.mk
+++ b/config/common.mk
@@ -54,6 +54,10 @@ PRODUCT_COPY_FILES +=  \
 PRODUCT_COPY_FILES += \
     frameworks/base/data/etc/android.software.sip.voip.xml:system/etc/permissions/android.software.sip.voip.xml
 
+# Don't export PS1 in /system/etc/mkshrc.
+PRODUCT_COPY_FILES += \
+    vendor/cm/prebuilt/common/etc/mkshrc:system/etc/mkshrc
+
 # Required CM packages
 PRODUCT_PACKAGES += \
     Camera \
diff --git a/prebuilt/common/etc/mkshrc b/prebuilt/common/etc/mkshrc
new file mode 100644
index 00000000..e2a55d37
--- /dev/null
+++ b/prebuilt/common/etc/mkshrc
@@ -0,0 +1,29 @@
+# Copyright (c) 2010
+#	Thorsten Glaser <t.glaser@tarent.de>
+# This file is provided under the same terms as mksh.
+#-
+# Minimal /system/etc/mkshrc for Android
+
+: ${TERM:=vt100} ${HOME:=/data} ${MKSH:=/system/bin/sh} ${HOSTNAME:=android}
+: ${SHELL:=$MKSH} ${USER:=$(typeset x=$(id); x=${x#*\(}; print -r -- ${x%%\)*})}
+if (( USER_ID )); then PS1='$'; else PS1='#'; fi
+function precmd {
+	typeset e=$?
+
+	(( e )) && print -n "$e|"
+}
+PS1='$(precmd)$USER@$HOSTNAME:${PWD:-?} '"$PS1 "
+export HOME HOSTNAME MKSH SHELL TERM USER
+alias l='ls'
+alias la='l -a'
+alias ll='l -l'
+alias lo='l -a -l'
+
+for p in ~/.bin; do
+	[[ -d $p/. ]] || continue
+	[[ :$PATH: = *:$p:* ]] || PATH=$p:$PATH
+done
+
+unset p
+
+: place customisations above this line