diff --git a/targets/TARGET_NORDIC/TARGET_NRF5_SDK13/sdk/libraries/timer/app_timer.c b/targets/TARGET_NORDIC/TARGET_NRF5_SDK13/sdk/libraries/timer/app_timer.c
index c18e42786d..33487310f6 100644
--- a/targets/TARGET_NORDIC/TARGET_NRF5_SDK13/sdk/libraries/timer/app_timer.c
+++ b/targets/TARGET_NORDIC/TARGET_NRF5_SDK13/sdk/libraries/timer/app_timer.c
@@ -35,7 +35,7 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  * 
  */
-#ifndef __MBED_CMSIS_RTOS_CM
+#ifndef MBED_CONF_RTOS_PRESENT
  
 #include "sdk_common.h"
 #if NRF_MODULE_ENABLED(APP_TIMER)
@@ -1076,4 +1076,4 @@ uint8_t app_timer_op_queue_utilization_get(void)
 }
 #endif
 #endif //NRF_MODULE_ENABLED(APP_TIMER)
-#endif // __MBED_CMSIS_RTOS_CM
+#endif // MBED_CONF_RTOS_PRESENT
diff --git a/targets/TARGET_NORDIC/TARGET_NRF5_SDK13/sdk/libraries/timer/app_timer_rtx.c b/targets/TARGET_NORDIC/TARGET_NRF5_SDK13/sdk/libraries/timer/app_timer_rtx.c
index 7e9a7bc10f..acf9e566c5 100644
--- a/targets/TARGET_NORDIC/TARGET_NRF5_SDK13/sdk/libraries/timer/app_timer_rtx.c
+++ b/targets/TARGET_NORDIC/TARGET_NRF5_SDK13/sdk/libraries/timer/app_timer_rtx.c
@@ -35,7 +35,7 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  * 
  */
-#ifdef __MBED_CMSIS_RTOS_CM
+#ifdef MBED_CONF_RTOS_PRESENT
  
 #include "sdk_common.h"
 #if NRF_MODULE_ENABLED(APP_TIMER)
@@ -282,4 +282,4 @@ uint32_t app_timer_cnt_diff_compute(uint32_t   ticks_to,
 }
 #endif //NRF_MODULE_ENABLED(APP_TIMER)
 
-#endif // __MBED_CMSIS_RTOS_CM
+#endif // MBED_CONF_RTOS_PRESENT