diff --git a/porting/npl/riot/include/nimble/nimble_npl_os.h b/porting/npl/riot/include/nimble/nimble_npl_os.h
index 16f514b84..e039ad654 100644
--- a/porting/npl/riot/include/nimble/nimble_npl_os.h
+++ b/porting/npl/riot/include/nimble/nimble_npl_os.h
@@ -218,6 +218,12 @@ ble_npl_callout_get_ticks(struct ble_npl_callout *co)
     return co->target_ticks;
 }
 
+static inline void
+ble_npl_callout_set_arg(struct ble_npl_callout *co, void *arg)
+{
+    co->e.arg = arg;
+}
+
 static inline uint32_t
 ble_npl_time_get(void)
 {
diff --git a/porting/npl/riot/src/npl_os_riot.c b/porting/npl/riot/src/npl_os_riot.c
index 98a5edf49..cc3909e7d 100644
--- a/porting/npl/riot/src/npl_os_riot.c
+++ b/porting/npl/riot/src/npl_os_riot.c
@@ -66,3 +66,11 @@ ble_npl_callout_reset(struct ble_npl_callout *c, ble_npl_time_t ticks)
     xtimer_set(&c->timer, ((ticks * 1000) - ((xtimer_now_usec() - now) / 1000)));
     return BLE_NPL_OK;
 }
+
+uint32_t
+ble_npl_callout_remaining_ticks(struct ble_npl_callout *co,
+                                ble_npl_time_t time)
+{
+    uint32_t now = xtimer_now_usec();
+    return ((uint32_t)co->target_ticks) - (now / 1000);
+}