diff --git a/express/build.sh b/express/build.sh
index 32dc60c..038f05f 100755
--- a/express/build.sh
+++ b/express/build.sh
@@ -2,7 +2,7 @@
 
 set -eu
 
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 cd "$DIR"
 
diff --git a/express/check.sh b/express/check.sh
index ed260a0..0dece7f 100755
--- a/express/check.sh
+++ b/express/check.sh
@@ -2,7 +2,7 @@
 
 set -eu
 
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 check_dir="$DIR"
 
diff --git a/express/run.sh b/express/run.sh
index 45e91bb..228defc 100755
--- a/express/run.sh
+++ b/express/run.sh
@@ -2,7 +2,7 @@
 
 set -eu
 
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 cd "$DIR"
 
diff --git a/express/show-config.sh b/express/show-config.sh
index 8e80baa..2c553a1 100755
--- a/express/show-config.sh
+++ b/express/show-config.sh
@@ -2,7 +2,7 @@
 
 set -e
 
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 check_dir="$DIR"
 
diff --git a/express/watch.sh b/express/watch.sh
index 1883f04..e1fba56 100755
--- a/express/watch.sh
+++ b/express/watch.sh
@@ -2,7 +2,7 @@
 
 set -e
 
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 check_dir="$DIR"