diff --git a/include/block/aio.h b/include/block/aio.h
index 3a546e7..8fba6a3 100644
--- a/include/block/aio.h
+++ b/include/block/aio.h
@@ -52,7 +52,6 @@
 typedef bool AioPollFn(void *opaque);
 typedef void IOHandler(void *opaque);
 
-struct Coroutine;
 struct ThreadPool;
 struct LinuxAioState;
 struct LuringState;
@@ -694,7 +693,7 @@
  * is the context in which the coroutine is running (i.e. the value of
  * qemu_get_current_aio_context() from the coroutine itself).
  */
-void aio_co_schedule(AioContext *ctx, struct Coroutine *co);
+void aio_co_schedule(AioContext *ctx, Coroutine *co);
 
 /**
  * aio_co_reschedule_self:
@@ -717,7 +716,7 @@
  * context.  The coroutine must not be entered by anyone else while
  * aio_co_wake() is active.
  */
-void aio_co_wake(struct Coroutine *co);
+void aio_co_wake(Coroutine *co);
 
 /**
  * aio_co_enter:
@@ -726,7 +725,7 @@
  *
  * Enter a coroutine in the specified AioContext.
  */
-void aio_co_enter(AioContext *ctx, struct Coroutine *co);
+void aio_co_enter(AioContext *ctx, Coroutine *co);
 
 /**
  * Return the AioContext whose event loop runs in the current thread.
diff --git a/util/async.c b/util/async.c
index 14d63b3..0657b75 100644
--- a/util/async.c
+++ b/util/async.c
@@ -640,7 +640,7 @@
     }
 }
 
-void aio_co_wake(struct Coroutine *co)
+void aio_co_wake(Coroutine *co)
 {
     AioContext *ctx;
 
@@ -653,7 +653,7 @@
     aio_co_enter(ctx, co);
 }
 
-void aio_co_enter(AioContext *ctx, struct Coroutine *co)
+void aio_co_enter(AioContext *ctx, Coroutine *co)
 {
     if (ctx != qemu_get_current_aio_context()) {
         aio_co_schedule(ctx, co);