diff --git a/hw/qdev.c b/hw/qdev.c
index c7884d0e824b149a0ebfa13058c90ebff214bf04..d19d531402ae144a07e852e53598dc8990346687 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -258,6 +258,8 @@ int qdev_unplug(DeviceState *dev)
                    dev->parent_bus->name);
         return -1;
     }
+    assert(dev->info->unplug != NULL);
+
     return dev->info->unplug(dev);
 }