diff --git a/shill_proxy.h b/shill_proxy.h
index 6d545f6..78f5b9b 100644
--- a/shill_proxy.h
+++ b/shill_proxy.h
@@ -32,7 +32,7 @@
 // This class implements the connection to shill using real DBus calls.
 class ShillProxy : public ShillProxyInterface {
  public:
-  explicit ShillProxy(const scoped_refptr<dbus::Bus>& bus);
+  ShillProxy() = default;
   ~ShillProxy() override = default;
 
   // Initializes the ShillProxy instance creating the manager proxy from the