diff --git a/tools/cooja/java/org/contikios/cooja/plugins/analyzers/PacketAnalyzer.java b/tools/cooja/java/org/contikios/cooja/plugins/analyzers/PacketAnalyzer.java
index 7f4002960..28a548e3c 100644
--- a/tools/cooja/java/org/contikios/cooja/plugins/analyzers/PacketAnalyzer.java
+++ b/tools/cooja/java/org/contikios/cooja/plugins/analyzers/PacketAnalyzer.java
@@ -27,7 +27,7 @@ public abstract class PacketAnalyzer {
 
     public Packet(byte[] data, int level) {
       this.level = level;
-      this.data = data;
+      this.data = data.clone();
       this.size = data.length;
     }