diff --git a/sys/sparc64/sparc64/trap.c b/sys/sparc64/sparc64/trap.c
index c451907f358..0976bb65013 100644
--- a/sys/sparc64/sparc64/trap.c
+++ b/sys/sparc64/sparc64/trap.c
@@ -260,7 +260,8 @@ sun4u_set_traptable(void *tba_addr)
 		cell_t tba_addr;
 	} args = {
 		(cell_t)"SUNW,set-trap-table",
-		2,
+		1,
+		0,
 	};
 
 	args.tba_addr = (cell_t)tba_addr;