diff --git a/lib/design.sh b/lib/design.sh
index 5106247..d7e041a 100644
--- a/lib/design.sh
+++ b/lib/design.sh
@@ -23,7 +23,7 @@
 
 # Add ignore rule to .git/info/exclude if not already present
 _design_add_git_exclude(){
-  local git_dir="$(cd $1 && readlink -m $(git rev-parse --git-dir))"
+  local git_dir="$(cd $1 && cd `git rev-parse --git-dir` && pwd -P)"
   if [ -e "$git_dir/info/exclude" ] && ! $(grep -q "$project_design_dir" "$git_dir/info/exclude"); then
     echo "$project_design_dir" >> "$git_dir/info/exclude"
   fi