diff --git a/powerlevel9k.zsh-theme b/powerlevel9k.zsh-theme
index ecca1f3..c6c17c8 100755
--- a/powerlevel9k.zsh-theme
+++ b/powerlevel9k.zsh-theme
@@ -758,7 +758,7 @@ prompt_dir() {
           for directory in ${paths[@]}
           do
             cur_dir=$directory
-            if (( ${#cur_dir} > $POWERLEVEL9K_SHORTEN_DIR_LENGTH + ${#POWERLEVEL9K_SHORTEN_DELIMITER} )) && [[ $cur_dir != $paths[${#paths}] ]]; then # only shorten if long enough and not last path
+            if (( ${#cur_dir} > ( $POWERLEVEL9K_SHORTEN_DIR_LENGTH + ${#POWERLEVEL9K_SHORTEN_DELIMITER} ) )) && [[ $cur_dir != $paths[${#paths}] ]]; then # only shorten if long enough and not last path
               cur_dir=${cur_dir:0:$POWERLEVEL9K_SHORTEN_DIR_LENGTH}$POWERLEVEL9K_SHORTEN_DELIMITER
             fi
             cur_short_path+="$cur_dir/"