diff --git a/src/coroutine/system.cc b/src/coroutine/system.cc
index 62635887d6..266e457215 100644
--- a/src/coroutine/system.cc
+++ b/src/coroutine/system.cc
@@ -770,7 +770,9 @@ int async(AsyncIouring::opcodes opcode,
     event.wbuf = wbuf;
     event.statxbuf = statxbuf;
     event.count = count;
+#ifdef HAVE_IOURING_FTRUNCATE
     event.offset = offset;
+#endif
 
     bool result = false;
     AsyncIouring *iouring = SwooleTG.async_iouring;