diff --git a/bash_aliases b/bash_aliases
index 5f1ccb5..dc7c25c 100755
--- a/bash_aliases
+++ b/bash_aliases
@@ -20,7 +20,7 @@ alias gvim='gvim --remote-tab-silent'
 alias cribbage='cribbage -r'
 alias backgammon='backgammon -r -pb'
 # put 'cattodo' in $PROMPT_COMMAND to use
-alias cattodo='if [[ $LAST_WD != $PWD ]]; then if [[ -r .todo ]]; then cat .todo; fi; LAST_WD=$PWD; fi'
+alias cattodo='if [[ $CATTODO_LAST_WD != $PWD ]]; then if [[ -r .todo ]]; then cat .todo; fi; CATTODO_LAST_WD=$PWD; fi'
 alias ls='ls --color=auto'
 alias strip-cr="sed -e 's/\x0d//'"
 alias rip='abcde -x -p -o mp3:"-v -b160"'