diff --git a/.gitignore b/.gitignore
index 567609b..3185451 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,6 @@
 build/
+
+#
+# macOS file system
+#
+.DS_Store
diff --git a/src/_adr_dir b/src/_adr_dir
index 27a3c48..419a786 100755
--- a/src/_adr_dir
+++ b/src/_adr_dir
@@ -13,7 +13,7 @@ function absdir() {
 	(cd $(dirname $1) && pwd -P)
 }
 
-while [ $(absdir $reldir) != / ]
+while [ "$(absdir $reldir)" != / ]
 do
 	if [ -f $(mkrel .adr-dir) ]
 	then