diff --git a/a8/xtimer.cc b/a8/xtimer.cc
index 8fa17d9..416e06e 100644
--- a/a8/xtimer.cc
+++ b/a8/xtimer.cc
@@ -320,6 +320,11 @@ namespace a8
                                 InternalDelete(timer, false, true);
                             }
                             break;
+                        case kIntervalTimer:
+                            {
+                                InternalModifyTime(timer, timer->expire_time);
+                            }
+                            break;
                         default:
                             {
                             }