diff --git a/platform/nrf52dk/platform-conf.h b/platform/nrf52dk/platform-conf.h
index bb073f4ab..d40fd2b3e 100644
--- a/platform/nrf52dk/platform-conf.h
+++ b/platform/nrf52dk/platform-conf.h
@@ -131,10 +131,10 @@ typedef uint32_t uip_stats_t;
 #define RTIMER_ARCH_SECOND 62500
 /*
  * rtimer.h typedefs rtimer_clock_t as unsigned short. We need to define
- * RTIMER_CLOCK_LT to override this
+ * RTIMER_CLOCK_DIFF to override this
+ */
 typedef uint32_t rtimer_clock_t;
-#define RTIMER_CLOCK_LT(a, b)     ((int32_t)((a) - (b)) < 0)
-*/
+#define RTIMER_CLOCK_DIFF(a,b)     ((int32_t)((a)-(b)))
 
 /** @} */
 /*---------------------------------------------------------------------------*/
diff --git a/regression-tests/24-compile-nrf52-ports/Makefile b/regression-tests/24-compile-nrf52-ports/Makefile
index c165d569d..bdf5b4a04 100644
--- a/regression-tests/24-compile-nrf52-ports/Makefile
+++ b/regression-tests/24-compile-nrf52-ports/Makefile
@@ -11,7 +11,8 @@ hello-world/nrf52dk \
 nrf52dk/coap-demo/nrf52dk:coap-server \
 nrf52dk/coap-demo/nrf52dk:coap-client:SERVER_IPV6_ADDR=ffff \
 nrf52dk/mqtt-demo/nrf52dk \
-nrf52dk/blink-hello/nrf52dk
+nrf52dk/blink-hello/nrf52dk \
+nrf52dk/timer-test/nrf52dk
 
 TOOLS=