diff --git a/src/Instance.cxx b/src/Instance.cxx
index 9ddec2eea..53cb00a33 100644
--- a/src/Instance.cxx
+++ b/src/Instance.cxx
@@ -34,6 +34,11 @@
 
 #include <stdexcept>
 
+Instance::Instance()
+	:idle_monitor(event_loop, BIND_THIS_METHOD(OnIdle))
+{
+}
+
 #ifdef ENABLE_DATABASE
 
 const Database &
diff --git a/src/Instance.hxx b/src/Instance.hxx
index d3391d64f..13cacc28b 100644
--- a/src/Instance.hxx
+++ b/src/Instance.hxx
@@ -91,8 +91,7 @@ struct Instance final
 
 	StateFile *state_file = nullptr;
 
-	Instance()
-		:idle_monitor(event_loop, BIND_THIS_METHOD(OnIdle)) {}
+	Instance();
 
 	/**
 	 * Initiate shutdown.  Wrapper for EventLoop::Break().