diff --git a/Util/GloballyThrottledStream.cs b/Util/GloballyThrottledStream.cs
index c49a21b..dbe92d6 100644
--- a/Util/GloballyThrottledStream.cs
+++ b/Util/GloballyThrottledStream.cs
@@ -78,7 +78,7 @@ private static long Leak(long mbps) {
     }
 
     public override int Read(byte[] buffer, int offset, int count) {
-        var mbps = _maxBytesPerSecond;
+        var mbps = Interlocked.Read(ref _maxBytesPerSecond);
 
         int amt;
         if (mbps == 0) {