diff --git a/model/src/main/java/lcsb/mapviewer/model/map/kinetics/SbmlKinetics.java b/model/src/main/java/lcsb/mapviewer/model/map/kinetics/SbmlKinetics.java
index 8b7b1058ff6e3ce6893aaaceb3e59198457e7696..b0e12129b79bf49bcd49053ff3684838bbe08633 100644
--- a/model/src/main/java/lcsb/mapviewer/model/map/kinetics/SbmlKinetics.java
+++ b/model/src/main/java/lcsb/mapviewer/model/map/kinetics/SbmlKinetics.java
@@ -83,7 +83,7 @@ public class SbmlKinetics implements Serializable {
   public SbmlKinetics(SbmlKinetics original) {
     this.definition = original.getDefinition();
     for (SbmlArgument argument : original.getArguments()) {
-      addArgument(argument.copy());
+      addArgument(argument);
     }
   }