diff --git a/sys/sparc64/include/bus.h b/sys/sparc64/include/bus.h
index 776eacdc027..888c80b1da0 100644
--- a/sys/sparc64/include/bus.h
+++ b/sys/sparc64/include/bus.h
@@ -628,7 +628,7 @@ bus_space_write_multi_stream_1(bus_space_tag_t t, bus_space_handle_t h,
 
 static __inline void
 bus_space_write_multi_stream_2(bus_space_tag_t t, bus_space_handle_t h,
-    bus_size_t o, uint16_t *a, size_t c)
+    bus_size_t o, const uint16_t *a, size_t c)
 {
 
 	while (c-- > 0)