diff --git a/platform/nrf52dk/platform-conf.h b/platform/nrf52dk/platform-conf.h
index bb073f4ab..cf89dc0a8 100644
--- a/platform/nrf52dk/platform-conf.h
+++ b/platform/nrf52dk/platform-conf.h
@@ -131,9 +131,9 @@ 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)))
 */
 
 /** @} */