diff --git a/agent/src/com/cloud/agent/resource/computing/LibvirtComputingResource.java b/agent/src/com/cloud/agent/resource/computing/LibvirtComputingResource.java
index fa6e8162cc1..8a730724284 100644
--- a/agent/src/com/cloud/agent/resource/computing/LibvirtComputingResource.java
+++ b/agent/src/com/cloud/agent/resource/computing/LibvirtComputingResource.java
@@ -3473,10 +3473,15 @@ public class LibvirtComputingResource extends ServerResourceBase implements Serv
     		}
     		
     		if (oldStats != null) {
-    			stats.setNetworkReadKBs((rx - oldStats._rx)/1000);
-    			stats.setNetworkWriteKBs((tx - oldStats._tx)/1000);
+    			long deltarx = rx - oldStats._rx;
+    			if (deltarx > 0)
+    				stats.setNetworkReadKBs(deltarx / 1000);
+    			long deltatx = tx - oldStats._tx;
+    			if (deltatx > 0)
+    				stats.setNetworkWriteKBs(deltatx / 1000);
     		}
-    		
+
+
     		vmStats newStat = new vmStats();
     		newStat._usedTime = info.cpuTime;
     		newStat._rx = rx;