diff --git a/tools/create_package.py b/tools/create_package.py
index fc7e663..13a4173 100644
--- a/tools/create_package.py
+++ b/tools/create_package.py
@@ -19,20 +19,19 @@ def GetVersion (rootDir):
 	return packageJson['version']
 
 def JSHintFolder (folder):
-	result = Tools.RunCommand (['jshint', folder])
+	result = Tools.RunCommand ('jshint', [folder])
 	if result != 0:
 		return False
 	return True
 
 def CompressFiles (inputFiles, outputFile):
 	parameters = []
-	parameters.append ('google-closure-compiler')
 	for inputFile in inputFiles:
 		extension = os.path.splitext (inputFile)[1]
 		if extension == '.js':
 			parameters.append ('--js=' + os.path.join ('..', inputFile))
 	parameters.append ('--js_output_file=' + outputFile)
-	result = Tools.RunCommand (parameters)
+	result = Tools.RunCommand ('google-closure-compiler', parameters)
 	if result != 0:
 		return False
 	return True
diff --git a/tools/lib/tools_lib.py b/tools/lib/tools_lib.py
index c8f8337..9951238 100644
--- a/tools/lib/tools_lib.py
+++ b/tools/lib/tools_lib.py
@@ -13,13 +13,9 @@ def WriteContentToFile (filePath, content):
 	fileObject.write (content)
 	fileObject.close ()
 
-def RunCommand (commands):
-	process = subprocess.Popen (commands, stdout = subprocess.PIPE, stderr = subprocess.PIPE, shell = True)
-	out, err = process.communicate ()
-	if process.returncode != 0:
-		print (out.decode ())
-		print (err.decode ())
-	return process.returncode
+def RunCommand (executable, arguments):
+	command = executable + ' "' + '" "'.join (arguments) + '"'
+	return os.system (command)
 
 class TokenReplacer:
 	def __init__ (self, filePath, keepToken):
diff --git a/tools/optimize_svg_files.py b/tools/optimize_svg_files.py
index c6f7c10..33b653a 100644
--- a/tools/optimize_svg_files.py
+++ b/tools/optimize_svg_files.py
@@ -7,8 +7,7 @@ def Main (argv):
 	currentDir = os.path.dirname (os.path.abspath (__file__))
 	os.chdir (currentDir)
 	imagesPath = os.path.abspath (os.path.join ('..', 'website', 'assets', 'images'))
-	for i in range (0, 5):
-		Tools.RunCommand (['svgo', '-r', imagesPath])
+	Tools.RunCommand ('svgo', ['-r', imagesPath])
 	return 0
 
 sys.exit (Main (sys.argv))