diff --git a/migration/rdma.c b/migration/rdma.c
index 1aac50b0de..1159f990af 100644
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -3075,7 +3075,7 @@ qio_channel_rdma_source_finalize(GSource *source)
     object_unref(OBJECT(ssource->rioc));
 }
 
-GSourceFuncs qio_channel_rdma_source_funcs = {
+static GSourceFuncs qio_channel_rdma_source_funcs = {
     qio_channel_rdma_source_prepare,
     qio_channel_rdma_source_check,
     qio_channel_rdma_source_dispatch,