diff --git a/.git_hooks_pre-commit b/.git_hooks_pre-commit
index 6b3b02e..e73b892 100755
--- a/.git_hooks_pre-commit
+++ b/.git_hooks_pre-commit
@@ -2,9 +2,9 @@
 
 set -e
 
-HOOKS=`dirname $0`
-GIT=`dirname $HOOKS`
-ROOT=`dirname $GIT`
+HOOKS=$(dirname $0)
+GIT=$(dirname $HOOKS)
+ROOT=$(dirname $GIT)
 
 . $ROOT/env/bin/activate
 $ROOT/script/lint