diff --git a/bin/build b/bin/build
index d7620ba61..1d7e92322 100755
--- a/bin/build
+++ b/bin/build
@@ -21,7 +21,7 @@
 # IN THE SOFTWARE.
 
 # Check if "npm install" was executed
-if [ ! -d ../node_modules ]; then
+if [[ ! -d ../node_modules ]]; then
   echo "\"node_modules\" not found:"
   echo "npm install"
   exit 1
diff --git a/bin/clean b/bin/clean
index 7838787b0..5b5fcf949 100755
--- a/bin/clean
+++ b/bin/clean
@@ -21,7 +21,7 @@
 # IN THE SOFTWARE.
 
 # Check if "npm install" was executed
-if [ ! -d ../node_modules ]; then
+if [[ ! -d ../node_modules ]]; then
   echo "\"node_modules\" not found:"
   echo "npm install"
   exit 1
diff --git a/bin/lint b/bin/lint
index 41cf7902d..3660919ce 100755
--- a/bin/lint
+++ b/bin/lint
@@ -21,7 +21,7 @@
 # IN THE SOFTWARE.
 
 # Check if "npm install" was executed
-if [ ! -d ../node_modules ]; then
+if [[ ! -d ../node_modules ]]; then
   echo "\"node_modules\" not found:"
   echo "npm install"
   exit 1
diff --git a/bin/start b/bin/start
index 43ac70f6b..d955357f4 100755
--- a/bin/start
+++ b/bin/start
@@ -21,7 +21,7 @@
 # IN THE SOFTWARE.
 
 # Check if "npm install" was executed
-if [ ! -d $(pwd)/node_modules ]; then
+if [[ ! -d ../node_modules ]]; then
   echo "\"node_modules\" not found:"
   echo "npm install"
   exit 1
diff --git a/bin/test b/bin/test
index 3098499bc..6e7b0a91f 100755
--- a/bin/test
+++ b/bin/test
@@ -21,7 +21,7 @@
 # IN THE SOFTWARE.
 
 # Check if "npm install" was executed
-if [ ! -d ../node_modules ]; then
+if [[ ! -d ../node_modules ]]; then
   echo "\"node_modules\" not found:"
   echo "npm install"
   exit 1