--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "test/librbd/mock/MockImageCtx.h"
+
+namespace librbd {
+
+MockImageCtx* MockImageCtx::s_instance = nullptr;
+
+} // namespace librbd