diff --git a/src/main/java/de/ctdo/bunti/model/BuntiEthersexDevice.java b/src/main/java/de/ctdo/bunti/model/BuntiEthersexDevice.java
index 7f04c23..1dd42c1 100644
--- a/src/main/java/de/ctdo/bunti/model/BuntiEthersexDevice.java
+++ b/src/main/java/de/ctdo/bunti/model/BuntiEthersexDevice.java
@@ -11,7 +11,7 @@ import java.util.Map;
 public abstract class BuntiEthersexDevice extends BuntiDevice {
     private String hostname;
     private int port;
-    private static final Map<String, Integer> ports = new HashMap<String, Integer>();
+    private final Map<String, Integer> ports = new HashMap<String, Integer>();
 
 
     public BuntiEthersexDevice() {