diff --git a/themes/blakefrost.zsh-theme b/themes/blakefrost.zsh-theme
index 447774a3d..03198feb5 100644
--- a/themes/blakefrost.zsh-theme
+++ b/themes/blakefrost.zsh-theme
@@ -6,4 +6,7 @@ ZSH_THEME_GIT_PROMPT_DIRTY="%{$fg[yellow]%}⚡%{$reset_color%}"
 ZSH_THEME_GIT_PROMPT_CLEAN=""
 
 PROMPT='%~%{$reset_color%}$(git_prompt_info) ★ %{$reset_color%}'
-RPROMPT='%{$fg[blue]%}$(rbenv version | cut -d " " -f 1 | sed "s/-/ /g")%{$reset_color%}'
+
+if which rbenv &> /dev/null; then
+  RPROMPT='%{$fg[blue]%}$(rbenv version | cut -d " " -f 1 | sed "s/-/ /g")%{$reset_color%}'
+fi