diff --git a/lib/isc/include/isc/atomic.h b/lib/isc/include/isc/atomic.h
index 809ee3e425..7a1bc8c38f 100644
--- a/lib/isc/include/isc/atomic.h
+++ b/lib/isc/include/isc/atomic.h
@@ -46,6 +46,9 @@
 #define atomic_compare_exchange_strong_relaxed(o, e, d) \
 	atomic_compare_exchange_strong_explicit(        \
 		(o), (e), (d), memory_order_relaxed, memory_order_relaxed)
+#define atomic_compare_exchange_strong_acq_rel(o, e, d)	\
+	atomic_compare_exchange_strong_explicit(        \
+		(o), (e), (d), memory_order_acq_rel, memory_order_acquire)
 
 /* Acquire-Release Memory Ordering */