diff --git a/tools/cooja/java/se/sics/cooja/Simulation.java b/tools/cooja/java/se/sics/cooja/Simulation.java
index 0fbe1297f..6cad2a24b 100644
--- a/tools/cooja/java/se/sics/cooja/Simulation.java
+++ b/tools/cooja/java/se/sics/cooja/Simulation.java
@@ -685,6 +685,12 @@ public class Simulation extends Observable implements Runnable {
 
     setChanged();
     notifyObservers(this);
+    
+    /* Execute simulation thread events now, before simulation starts */
+    while (hasPollRequests) {
+      popSimulationInvokes().run();
+    }
+    
     return true;
   }