diff --git a/server/src/com/cloud/network/NetworkManagerImpl.java b/server/src/com/cloud/network/NetworkManagerImpl.java
index 167ae532486..10ac8c6d2ff 100755
--- a/server/src/com/cloud/network/NetworkManagerImpl.java
+++ b/server/src/com/cloud/network/NetworkManagerImpl.java
@@ -3305,8 +3305,8 @@ public class NetworkManagerImpl implements NetworkManager, NetworkService, Manag
             }
             
             //don't allow to update shared network
-            if (offering.getGuestType() == GuestType.Shared) {
-            	throw new InvalidParameterValueException("Can't upgrade the networkDomain for the network of type " + GuestType.Isolated);
+            if (offering.getGuestType() != GuestType.Isolated) {
+            	throw new InvalidParameterValueException("networkDomain can be upgraded only for the network of type " + GuestType.Isolated);
             }
             
             long offeringId = oldNetworkOfferingId;