diff --git a/core/net/mac/contikimac/contikimac.c b/core/net/mac/contikimac/contikimac.c
index 3c655314a..60e3d2569 100644
--- a/core/net/mac/contikimac/contikimac.c
+++ b/core/net/mac/contikimac/contikimac.c
@@ -614,7 +614,12 @@ send_packet(mac_callback_t mac_callback, void *mac_callback_ptr,
     return MAC_TX_ERR_FATAL;
   }
 #endif
-
+  packetbuf_compact();
+  
+  if(!NETSTACK_LLSEC.on_frame_created()) {
+    return MAC_TX_ERR_FATAL;
+  }
+  
   /* Make sure that the packet is longer or equal to the shortest
      packet length. */
   transmit_len = packetbuf_totlen();
@@ -628,9 +633,6 @@ send_packet(mac_callback_t mac_callback, void *mac_callback_ptr,
     transmit_len = SHORTEST_PACKET_SIZE;
   }
 
-
-  packetbuf_compact();
-
 #ifdef NETSTACK_ENCRYPT
   NETSTACK_ENCRYPT();
 #endif /* NETSTACK_ENCRYPT */
diff --git a/core/net/mac/nullrdc.c b/core/net/mac/nullrdc.c
index 7e7be6004..36565607c 100644
--- a/core/net/mac/nullrdc.c
+++ b/core/net/mac/nullrdc.c
@@ -120,7 +120,7 @@ send_one_packet(mac_callback_t sent, void *ptr)
   packetbuf_set_attr(PACKETBUF_ATTR_MAC_ACK, 1);
 #endif /* NULLRDC_802154_AUTOACK || NULLRDC_802154_AUTOACK_HW */
 
-  if(NETSTACK_FRAMER.create() < 0) {
+  if((NETSTACK_FRAMER.create() < 0) || !NETSTACK_LLSEC.on_frame_created()) {
     /* Failed to allocate space for headers */
     PRINTF("nullrdc: send failed, too large header\n");
     ret = MAC_TX_ERR_FATAL;