diff --git a/src/dbus_singleton.cpp b/src/dbus_singleton.cpp
new file mode 100644
index 0000000..f78164f
--- /dev/null
+++ b/src/dbus_singleton.cpp
@@ -0,0 +1,13 @@
+#include "dbus_singleton.hpp"
+
+#include <boost/asio/io_context.hpp>
+
+namespace crow
+{
+namespace connections
+{
+
+sdbusplus::asio::connection* systemBus = nullptr;
+
+} // namespace connections
+} // namespace crow