diff --git a/server/src/com/cloud/configuration/ConfigurationManagerImpl.java b/server/src/com/cloud/configuration/ConfigurationManagerImpl.java
index f0c7f354dec..20037167487 100755
--- a/server/src/com/cloud/configuration/ConfigurationManagerImpl.java
+++ b/server/src/com/cloud/configuration/ConfigurationManagerImpl.java
@@ -36,6 +36,8 @@ import javax.ejb.Local;
 import javax.inject.Inject;
 import javax.naming.ConfigurationException;
 
+import org.apache.log4j.Logger;
+
 import org.apache.cloudstack.acl.SecurityChecker;
 import org.apache.cloudstack.affinity.AffinityGroup;
 import org.apache.cloudstack.affinity.AffinityGroupService;
@@ -83,7 +85,6 @@ import org.apache.cloudstack.region.dao.RegionDao;
 import org.apache.cloudstack.storage.datastore.db.PrimaryDataStoreDao;
 import org.apache.cloudstack.storage.datastore.db.StoragePoolDetailsDao;
 import org.apache.cloudstack.storage.datastore.db.StoragePoolVO;
-import org.apache.log4j.Logger;
 
 import com.cloud.alert.AlertManager;
 import com.cloud.api.ApiDBUtils;
@@ -2640,8 +2641,9 @@ public class ConfigurationManagerImpl extends ManagerBase implements Configurati
                 }
             }
             return NetUtils.supersetOrSubset.neitherSubetNorSuperset;
-        } else if (newVlanGateway == null || newVlanGateway == null) {
-            throw new InvalidParameterValueException("either both netmask and gateway should be passed or both should me omited.");
+        } else if (newVlanGateway == null || newVlanNetmask == null) {
+            throw new InvalidParameterValueException(
+                    "either both netmask and gateway should be passed or both should me omited.");
         } else {
             if (!NetUtils.sameSubnet(startIP, newVlanGateway, newVlanNetmask)) {
                 throw new InvalidParameterValueException("The start ip and gateway do not belong to the same subnet");