diff --git a/dlls/ntdll/unix/file.c b/dlls/ntdll/unix/file.c
index 712f94ec43f..5da9ca560f6 100644
--- a/dlls/ntdll/unix/file.c
+++ b/dlls/ntdll/unix/file.c
@@ -4690,7 +4690,6 @@ static NTSTATUS irp_completion( void *user, ULONG_PTR *info, NTSTATUS status )
             req->user_arg = wine_server_client_ptr( async );
             wine_server_set_reply( req, async->buffer, async->size );
             status = virtual_locked_server_call( req );
-            *info = reply->size;
         }
         SERVER_END_REQ;
     }
diff --git a/dlls/ntdll/unix/server.c b/dlls/ntdll/unix/server.c
index 986eb6c3250..d0cfd4cd46c 100644
--- a/dlls/ntdll/unix/server.c
+++ b/dlls/ntdll/unix/server.c
@@ -378,7 +378,7 @@ static void invoke_system_apc( const apc_call_t *call, apc_result_t *result, BOO
     case APC_ASYNC_IO:
     {
         struct async_fileio *user = wine_server_get_ptr( call->async_io.user );
-        ULONG_PTR info = 0;
+        ULONG_PTR info = call->async_io.result;
 
         result->type = call->type;
         result->async_io.status = user->callback( user, &info, call->async_io.status );
diff --git a/dlls/ntdll/unix/socket.c b/dlls/ntdll/unix/socket.c
index 8469def786a..db58d2e5b12 100644
--- a/dlls/ntdll/unix/socket.c
+++ b/dlls/ntdll/unix/socket.c
@@ -565,7 +565,6 @@ static NTSTATUS try_recv( int fd, struct async_recv_ioctl *async, ULONG_PTR *siz
 static NTSTATUS async_recv_proc( void *user, ULONG_PTR *info, NTSTATUS status )
 {
     struct async_recv_ioctl *async = user;
-    ULONG_PTR information = 0;
     int fd, needs_close;
 
     TRACE( "%#x\n", status );
@@ -575,19 +574,15 @@ static NTSTATUS async_recv_proc( void *user, ULONG_PTR *info, NTSTATUS status )
         if ((status = server_get_unix_fd( async->io.handle, 0, &fd, &needs_close, NULL, NULL )))
             return status;
 
-        status = try_recv( fd, async, &information );
-        TRACE( "got status %#x, %#lx bytes read\n", status, information );
+        status = try_recv( fd, async, info );
+        TRACE( "got status %#x, %#lx bytes read\n", status, *info );
 
         if (status == STATUS_DEVICE_NOT_READY)
             status = STATUS_PENDING;
 
         if (needs_close) close( fd );
     }
-    if (status != STATUS_PENDING)
-    {
-        *info = information;
-        release_fileio( &async->io );
-    }
+    if (status != STATUS_PENDING) release_fileio( &async->io );
     return status;
 }
 
@@ -704,7 +699,6 @@ static ULONG_PTR fill_poll_output( struct async_poll_ioctl *async, NTSTATUS stat
 static NTSTATUS async_poll_proc( void *user, ULONG_PTR *info, NTSTATUS status )
 {
     struct async_poll_ioctl *async = user;
-    ULONG_PTR information = 0;
 
     if (status == STATUS_ALERTED)
     {
@@ -716,12 +710,11 @@ static NTSTATUS async_poll_proc( void *user, ULONG_PTR *info, NTSTATUS status )
         }
         SERVER_END_REQ;
 
-        information = fill_poll_output( async, status );
+        *info = fill_poll_output( async, status );
     }
 
     if (status != STATUS_PENDING)
     {
-        *info = information;
         free( async->input );
         release_fileio( &async->io );
     }
diff --git a/include/wine/server_protocol.h b/include/wine/server_protocol.h
index e22da223894..e5437576193 100644
--- a/include/wine/server_protocol.h
+++ b/include/wine/server_protocol.h
@@ -492,6 +492,7 @@ typedef union
         unsigned int     status;
         client_ptr_t     user;
         client_ptr_t     sb;
+        data_size_t      result;
     } async_io;
     struct
     {
@@ -2896,9 +2897,7 @@ struct get_async_result_request
 struct get_async_result_reply
 {
     struct reply_header __header;
-    data_size_t    size;
     /* VARARG(out_data,bytes); */
-    char __pad_12[4];
 };
 
 
@@ -6257,7 +6256,7 @@ union generic_reply
 
 /* ### protocol_version begin ### */
 
-#define SERVER_PROTOCOL_VERSION 729
+#define SERVER_PROTOCOL_VERSION 730
 
 /* ### protocol_version end ### */
 
diff --git a/server/async.c b/server/async.c
index 7cffd24a18b..bdc7620e9a1 100644
--- a/server/async.c
+++ b/server/async.c
@@ -185,11 +185,11 @@ void async_terminate( struct async *async, unsigned int status )
         data.type            = APC_ASYNC_IO;
         data.async_io.user   = async->data.user;
         data.async_io.sb     = async->data.iosb;
+        data.async_io.result = iosb ? iosb->result : 0;
 
-        /* if the result is nonzero or there is output data, the client needs to
-         * make an extra request to retrieve them; use STATUS_ALERTED to signal
-         * this case */
-        if (iosb && (iosb->result || iosb->out_data))
+        /* if there is output data, the client needs to make an extra request
+         * to retrieve it; use STATUS_ALERTED to signal this case */
+        if (iosb && iosb->out_data)
             data.async_io.status = STATUS_ALERTED;
         else
             data.async_io.status = status;
@@ -719,6 +719,5 @@ DECL_HANDLER(get_async_result)
             iosb->out_data = NULL;
         }
     }
-    reply->size = iosb->result;
     set_error( iosb->status );
 }
diff --git a/server/protocol.def b/server/protocol.def
index 02c1f269be7..cc1887dae2d 100644
--- a/server/protocol.def
+++ b/server/protocol.def
@@ -508,6 +508,7 @@ typedef union
         unsigned int     status;   /* I/O status */
         client_ptr_t     user;     /* user pointer */
         client_ptr_t     sb;       /* status block */
+        data_size_t      result;   /* result size */
     } async_io;
     struct
     {
@@ -2156,7 +2157,6 @@ enum message_type
 @REQ(get_async_result)
     client_ptr_t   user_arg;      /* user arg used to identify async */
 @REPLY
-    data_size_t    size;          /* result size (input or output depending on the operation) */
     VARARG(out_data,bytes);       /* iosb output data */
 @END
 
diff --git a/server/request.h b/server/request.h
index f3567cd967f..6fe708e065f 100644
--- a/server/request.h
+++ b/server/request.h
@@ -1396,8 +1396,7 @@ C_ASSERT( FIELD_OFFSET(struct cancel_async_request, only_thread) == 24 );
 C_ASSERT( sizeof(struct cancel_async_request) == 32 );
 C_ASSERT( FIELD_OFFSET(struct get_async_result_request, user_arg) == 16 );
 C_ASSERT( sizeof(struct get_async_result_request) == 24 );
-C_ASSERT( FIELD_OFFSET(struct get_async_result_reply, size) == 8 );
-C_ASSERT( sizeof(struct get_async_result_reply) == 16 );
+C_ASSERT( sizeof(struct get_async_result_reply) == 8 );
 C_ASSERT( FIELD_OFFSET(struct read_request, async) == 16 );
 C_ASSERT( FIELD_OFFSET(struct read_request, pos) == 56 );
 C_ASSERT( sizeof(struct read_request) == 64 );
diff --git a/server/trace.c b/server/trace.c
index da8c74cea2b..cfa6eefc36c 100644
--- a/server/trace.c
+++ b/server/trace.c
@@ -181,7 +181,7 @@ static void dump_apc_call( const char *prefix, const apc_call_t *call )
     case APC_ASYNC_IO:
         dump_uint64( "APC_ASYNC_IO,user=", &call->async_io.user );
         dump_uint64( ",sb=", &call->async_io.sb );
-        fprintf( stderr, ",status=%s", get_status_name(call->async_io.status) );
+        fprintf( stderr, ",status=%s,result=%u", get_status_name(call->async_io.status), call->async_io.result );
         break;
     case APC_VIRTUAL_ALLOC:
         dump_uint64( "APC_VIRTUAL_ALLOC,addr==", &call->virtual_alloc.addr );
@@ -2845,8 +2845,7 @@ static void dump_get_async_result_request( const struct get_async_result_request
 
 static void dump_get_async_result_reply( const struct get_async_result_reply *req )
 {
-    fprintf( stderr, " size=%u", req->size );
-    dump_varargs_bytes( ", out_data=", cur_size );
+    dump_varargs_bytes( " out_data=", cur_size );
 }
 
 static void dump_read_request( const struct read_request *req )