diff --git a/ipconfig.cc b/ipconfig.cc
index 092e279..b386c46 100644
--- a/ipconfig.cc
+++ b/ipconfig.cc
@@ -12,7 +12,7 @@
 
 namespace shill {
 
-IPConfig::IPConfig(const Device &device) : device_(device) {
+IPConfig::IPConfig(DeviceConstRefPtr device) : device_(device) {
   VLOG(2) << "IPConfig created.";
 }
 
@@ -21,7 +21,7 @@
 }
 
 const string &IPConfig::GetDeviceName() const {
-  return device().UniqueName();
+  return device()->UniqueName();
 }
 
 bool IPConfig::Request() {