diff --git a/src/Audio/StreamingSound.cs b/src/Audio/StreamingSound.cs
index 5d503b9..2f3630d 100644
--- a/src/Audio/StreamingSound.cs
+++ b/src/Audio/StreamingSound.cs
@@ -84,8 +84,11 @@ namespace MoonWorks.Audio
 
 		public override void Stop()
 		{
-			ConsumingBuffers = false;
-			State = SoundState.Stopped;
+			lock (StateLock)
+			{
+				ConsumingBuffers = false;
+				State = SoundState.Stopped;
+			}
 		}
 
 		public override void StopImmediate()