diff --git a/OpenSim/Region/ClientStack/LindenUDP/LLPacketHandler.cs b/OpenSim/Region/ClientStack/LindenUDP/LLPacketHandler.cs
index 998a0f1e8c..d32ed5d0d8 100644
--- a/OpenSim/Region/ClientStack/LindenUDP/LLPacketHandler.cs
+++ b/OpenSim/Region/ClientStack/LindenUDP/LLPacketHandler.cs
@@ -379,7 +379,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
                     m_PendingAcksMap.Remove(m_PendingAcks[i]);
                 }
-                m_PendingAcksMap.Clear();
+                m_PendingAcks.Clear();
 
                 acks.Header.Reliable = false;
                 OutPacket(acks, ThrottleOutPacketType.Unknown);