diff --git a/vars/buildDocker.groovy b/vars/buildDocker.groovy
index 3f3dd15..24affbb 100644
--- a/vars/buildDocker.groovy
+++ b/vars/buildDocker.groovy
@@ -4,7 +4,7 @@ def call(env){
   
   def content = readFile 'common.bash'
 
-  Properties properties = new Properties
+  Properties properties = new Properties()
   InputStream is = new ByteArrayInputStream(content.getBytes());
   properties.load(is)