diff --git a/core/net/mac/nullrdc.c b/core/net/mac/nullrdc.c
index 5cec23a3d..a8d83aa66 100644
--- a/core/net/mac/nullrdc.c
+++ b/core/net/mac/nullrdc.c
@@ -46,10 +46,10 @@
 #include "net/rime/rimestats.h"
 #include <string.h>
 
-#if CONTIKI_TARGET_COOJA
+#if CONTIKI_TARGET_COOJA || CONTIKI_TARGET_COOJA_IP64
 #include "lib/simEnvChange.h"
 #include "sys/cooja_mt.h"
-#endif /* CONTIKI_TARGET_COOJA */
+#endif /* CONTIKI_TARGET_COOJA || CONTIKI_TARGET_COOJA_IP64 */
 
 #define DEBUG 0
 #if DEBUG
@@ -158,10 +158,10 @@ send_one_packet(mac_callback_t sent, void *ptr)
           wt = RTIMER_NOW();
           watchdog_periodic();
           while(RTIMER_CLOCK_LT(RTIMER_NOW(), wt + ACK_WAIT_TIME)) {
-#if CONTIKI_TARGET_COOJA
+#if CONTIKI_TARGET_COOJA || CONTIKI_TARGET_COOJA_IP64
             simProcessRunValue = 1;
             cooja_mt_yield();
-#endif /* CONTIKI_TARGET_COOJA */
+#endif /* CONTIKI_TARGET_COOJA || CONTIKI_TARGET_COOJA_IP64 */
           }
 
           ret = MAC_TX_NOACK;
@@ -176,10 +176,10 @@ send_one_packet(mac_callback_t sent, void *ptr)
               watchdog_periodic();
               while(RTIMER_CLOCK_LT(RTIMER_NOW(),
                                     wt + AFTER_ACK_DETECTED_WAIT_TIME)) {
-      #if CONTIKI_TARGET_COOJA
+      #if CONTIKI_TARGET_COOJA || CONTIKI_TARGET_COOJA_IP64
                   simProcessRunValue = 1;
                   cooja_mt_yield();
-      #endif /* CONTIKI_TARGET_COOJA */
+      #endif /* CONTIKI_TARGET_COOJA || CONTIKI_TARGET_COOJA_IP64 */
               }
             }