diff --git a/qemu-common.h b/qemu-common.h
index a8144cb..f009796 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -160,7 +160,8 @@ void qemu_mutex_lock_iothread(void);
 void qemu_mutex_unlock_iothread(void);

 int qemu_open(const char *name, int flags, ...);
-ssize_t qemu_write_full(int fd, const void *buf, size_t count);
+ssize_t qemu_write_full(int fd, const void *buf, size_t count)
+    QEMU_WARN_UNUSED_RESULT;
 void qemu_set_cloexec(int fd);

 #ifndef _WIN32