diff --git a/server/src/com/cloud/network/NetworkModelImpl.java b/server/src/com/cloud/network/NetworkModelImpl.java
index 189382eed51..8aa18c1a8f7 100644
--- a/server/src/com/cloud/network/NetworkModelImpl.java
+++ b/server/src/com/cloud/network/NetworkModelImpl.java
@@ -1931,9 +1931,9 @@ public class NetworkModelImpl extends ManagerBase implements NetworkModel {
         }
 
         int cidrSize = NetUtils.getIp6CidrSize(ip6Cidr);
-        // Ipv6 cidr limit should be at least /64
-        if (cidrSize < 64) {
-            throw new InvalidParameterValueException("The cidr size of IPv6 network must be no less than 64 bits!");
+        // we only support cidr == 64
+        if (cidrSize != 64) {
+            throw new InvalidParameterValueException("The cidr size of IPv6 network must be 64 bits!");
         }
     }