diff --git a/qemu/include/qemu/atomic.h b/qemu/include/qemu/atomic.h
index 395f64d6..fb16c37d 100644
--- a/qemu/include/qemu/atomic.h
+++ b/qemu/include/qemu/atomic.h
@@ -194,7 +194,7 @@ void _ReadWriteBarrier(void);
 /* Returns the eventual value, failed or not */
 #define atomic_cmpxchg__nocheck(ptr, old, new)    ({                    \
     typeof_strip_qual(*ptr) _old = (old);                               \
-    __atomic_compare_exchange_n(ptr, &_old, new, false,                 \
+    (void)__atomic_compare_exchange_n(ptr, &_old, new, false,           \
                               __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);      \
     _old;                                                               \
 })