diff --git a/Lidgren.Network/NetPeer.Internal.cs b/Lidgren.Network/NetPeer.Internal.cs
index dbf449a..408a14a 100644
--- a/Lidgren.Network/NetPeer.Internal.cs
+++ b/Lidgren.Network/NetPeer.Internal.cs
@@ -270,7 +270,7 @@ namespace Lidgren.Network
 			int maxCHBpS = 1250 - m_connections.Count;
 			if (maxCHBpS < 250)
 				maxCHBpS = 250;
-			if (delta > (1.0 / (double)maxCHBpS)) // max connection heartbeats/second max
+			if (delta > (1.0 / (double)maxCHBpS) || delta < 0.0) // max connection heartbeats/second max
 			{
 				m_frameCounter++;
 				m_lastHeartbeat = dnow;
diff --git a/Lidgren.Network/NetTime.cs b/Lidgren.Network/NetTime.cs
index 494ab97..9e2f59d 100644
--- a/Lidgren.Network/NetTime.cs
+++ b/Lidgren.Network/NetTime.cs
@@ -40,10 +40,12 @@ namespace Lidgren.Network
 		/// </summary>
 		public static double Now { get { return (double)(Stopwatch.GetTimestamp() - s_timeInitialized) * s_dInvFreq; } }
 #else
+		private static readonly uint s_timeInitialized = (uint)Environment.TickCount;
+
 		/// <summary>
 		/// Get number of seconds since the application started
 		/// </summary>
-		public static double Now { get { return (double)Environment.TickCount / 1000.0; } }
+		public static double Now { get { return (double)((uint)Environment.TickCount - s_timeInitialized) / 1000.0; } }
 #endif
 
 		/// <summary>