diff --git a/themes/bira.zsh-theme b/themes/bira.zsh-theme
index 29bda0be8..55857270a 100644
--- a/themes/bira.zsh-theme
+++ b/themes/bira.zsh-theme
@@ -12,7 +12,7 @@ fi
 
 local current_dir='%{$terminfo[bold]$fg[blue]%}%~%{$reset_color%}'
 local rvm_ruby=''
-if which rvm-prompt &> /dev/null; then
+if [[ -s ~/.rvm/scripts/rvm ]] ; then 
   rvm_ruby='%{$fg[red]%}‹$(rvm-prompt i v g)›%{$reset_color%}'
 else
   if which rbenv &> /dev/null; then