diff --git a/tools/cooja/apps/mspsim/src/org/contikios/cooja/mspmote/interfaces/Msp802154Radio.java b/tools/cooja/apps/mspsim/src/org/contikios/cooja/mspmote/interfaces/Msp802154Radio.java
index 9937e6a74..31aa30377 100644
--- a/tools/cooja/apps/mspsim/src/org/contikios/cooja/mspmote/interfaces/Msp802154Radio.java
+++ b/tools/cooja/apps/mspsim/src/org/contikios/cooja/mspmote/interfaces/Msp802154Radio.java
@@ -146,7 +146,7 @@ public class Msp802154Radio extends Radio implements CustomDataRadio {
             setChanged();
             notifyObservers();
           }
-          isSynchronized = false;
+          finishTransmission();
         }
       }
     }); /* addRFListener */