diff --git a/qga/main.c b/qga/main.c
index a9b968c..47a6bea 100644
--- a/qga/main.c
+++ b/qga/main.c
@@ -605,6 +605,7 @@ static gboolean channel_event_cb(GIOCondition condition, gpointer data)
         if (!s->virtio) {
             return false;
         }
+        /* fall through */
     case G_IO_STATUS_AGAIN:
         /* virtio causes us to spin here when no process is attached to
          * host-side chardev. sleep a bit to mitigate this