diff --git a/usr/share/byobu/profiles/bashrc b/usr/share/byobu/profiles/bashrc
index 1455193e..3890cc1c 100644
--- a/usr/share/byobu/profiles/bashrc
+++ b/usr/share/byobu/profiles/bashrc
@@ -25,6 +25,8 @@ case "$TERM" in
 esac
 [ -n "$BYOBU_CHARMAP" ] || BYOBU_CHARMAP=$(locale charmap 2>/dev/null || echo)
 [ -z "$USER" ] && export USER=$(whoami)
+[ -z "$BYOBU_RUN_DIR" ] && export BYOBU_RUN_DIR=/tmp
+[ -z "$BYOBU_PREFIX" ] && export BYOBU_PREFIX=/usr
 byobu_prompt_status() { local e=$?; [ $e != 0 ] && echo -e " $e "; }
 byobu_prompt_symbol() { [ "$USER" = "root" ] && printf "%s" "#" || printf "%s" "\$"; }
 byobu_prompt_runtime() {