diff --git a/src/main/java/de/ailis/usb4java/DeviceListenerList.java b/src/main/java/de/ailis/usb4java/DeviceListenerList.java
index b2a9323..5e932c3 100644
--- a/src/main/java/de/ailis/usb4java/DeviceListenerList.java
+++ b/src/main/java/de/ailis/usb4java/DeviceListenerList.java
@@ -23,7 +23,7 @@ final class DeviceListenerList extends
      */
     DeviceListenerList()
     {
-        // Empty
+        super();
     }
     
     @Override
diff --git a/src/main/java/de/ailis/usb4java/PipeListenerList.java b/src/main/java/de/ailis/usb4java/PipeListenerList.java
index b713cd8..87f3633 100644
--- a/src/main/java/de/ailis/usb4java/PipeListenerList.java
+++ b/src/main/java/de/ailis/usb4java/PipeListenerList.java
@@ -22,7 +22,7 @@ final class PipeListenerList extends
      */
     PipeListenerList()
     {
-        // Empty
+        super();
     }
     
     @Override
diff --git a/src/main/java/de/ailis/usb4java/ServicesListenerList.java b/src/main/java/de/ailis/usb4java/ServicesListenerList.java
index b938d01..12c2556 100644
--- a/src/main/java/de/ailis/usb4java/ServicesListenerList.java
+++ b/src/main/java/de/ailis/usb4java/ServicesListenerList.java
@@ -21,7 +21,7 @@ final class ServicesListenerList extends
      */
     ServicesListenerList()
     {
-        // Empty
+        super();
     }
 
     @Override