diff --git a/darwin/Classes/AudioPlayer.m b/darwin/Classes/AudioPlayer.m
index a474917..696ff45 100644
--- a/darwin/Classes/AudioPlayer.m
+++ b/darwin/Classes/AudioPlayer.m
@@ -541,7 +541,8 @@
         //__weak __typeof__(self) weakSelf = self;
         //typeof(self) __weak weakSelf = self;
         __unsafe_unretained typeof(self) weakSelf = self;
-        if (!@available(macOS 10.12, iOS 10.0, *)) {
+        if (@available(macOS 10.12, iOS 10.0, *)) {}
+        else {
             _timeObserver = [_player addPeriodicTimeObserverForInterval:CMTimeMake(200, 1000)
                                                                   queue:nil
                                                              usingBlock:^(CMTime time) {
@@ -869,7 +870,8 @@
     }
     [_player play];
     [self updatePosition];
-    if (!@available(macOS 10.12, iOS 10.0, *)) {
+    if (@available(macOS 10.12, iOS 10.0, *)) {}
+    else {
         if (_bufferUnconfirmed && !_player.currentItem.playbackBufferFull) {
             [self enterBuffering:@"play, _bufferUnconfirmed && !playbackBufferFull"];
             [self broadcastPlaybackEvent];