diff --git a/sys/sparc64/include/atomic.h b/sys/sparc64/include/atomic.h
index 789ed2410ab0..c70e99aea70b 100644
--- a/sys/sparc64/include/atomic.h
+++ b/sys/sparc64/include/atomic.h
@@ -319,6 +319,7 @@ ATOMIC_GEN(ptr, uintptr_t *, uintptr_t, uintptr_t, 64);
 #define	atomic_fetchadd_int	atomic_add_int
 #define	atomic_fetchadd_32	atomic_add_32
 #define	atomic_fetchadd_long	atomic_add_long
+#define	atomic_fetchadd_64	atomic_add_64
 
 #undef ATOMIC_GEN
 #undef atomic_cas