diff --git a/sys/powerpc/ofw/rtas.c b/sys/powerpc/ofw/rtas.c
index 65f5ffbdc21a..693f3dd915b6 100644
--- a/sys/powerpc/ofw/rtas.c
+++ b/sys/powerpc/ofw/rtas.c
@@ -177,7 +177,7 @@ rtas_real_map(const void *buf, size_t len)
 	phys = rtas_bounce_phys + rtas_bounce_offset;
 	rtas_bounce_offset += len;
 
-	return (phys);
+	return (phys | DMAP_BASE_ADDRESS);
 }
 
 static void