diff --git a/src/internet/model/ipv6-l3-protocol.cc b/src/internet/model/ipv6-l3-protocol.cc
index 54acd8677..134e07ca7 100644
--- a/src/internet/model/ipv6-l3-protocol.cc
+++ b/src/internet/model/ipv6-l3-protocol.cc
@@ -433,7 +433,7 @@ void Ipv6L3Protocol::SetupLoopback ()
   /* see if we have already an loopback NetDevice */
   for (i = 0; i < m_node->GetNDevices (); i++)
     {
-      if (device = DynamicCast<LoopbackNetDevice> (m_node->GetDevice (i)))
+      if ((device = DynamicCast<LoopbackNetDevice> (m_node->GetDevice (i))))
         {
           break;
         }