diff --git a/plugins/mercurial/mercurial.plugin.zsh b/plugins/mercurial/mercurial.plugin.zsh
index 062baaa34..32060a47d 100644
--- a/plugins/mercurial/mercurial.plugin.zsh
+++ b/plugins/mercurial/mercurial.plugin.zsh
@@ -17,4 +17,14 @@ function hg_current_branch() {
   if [ -d .hg ]; then
     echo $(hg branch)
   fi
+}
+
+parse_hg_dirty() {
+  hg status 2> /dev/null \
+    | awk '$1 == "?" { unknown = 1 } 
+           $1 != "?" { changed = 1 }
+           END {
+             if (changed) printf "$ZSH_THEME_GIT_PROMPT_DIRTY"
+             else if (unknown) printf "$ZSH_THEME_GIT_PROMPT_CLEAN" 
+           }'
 }
\ No newline at end of file