diff --git a/block/iscsi.c b/block/iscsi.c
index 612de127e5..a316d46d96 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -290,7 +290,8 @@ iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
     }
 }
 
-static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask)
+static void coroutine_fn
+iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask)
 {
     *iTask = (struct IscsiTask) {
         .co         = qemu_coroutine_self(),