diff --git a/tools/cooja/java/se/sics/cooja/GUI.java b/tools/cooja/java/se/sics/cooja/GUI.java
index 3ef3b2217..07cbdc7f4 100644
--- a/tools/cooja/java/se/sics/cooja/GUI.java
+++ b/tools/cooja/java/se/sics/cooja/GUI.java
@@ -2631,6 +2631,7 @@ public class GUI extends Observable {
           mySimulation.addMote(newMote);
         }
       }
+      updateGUIComponentState();
 
     } else {
       logger.warn("No simulation active");