diff --git a/sys/ia64/ia64/db_trace.c b/sys/ia64/ia64/db_trace.c
index 7c6e2a4b303..4ce6d84819d 100644
--- a/sys/ia64/ia64/db_trace.c
+++ b/sys/ia64/ia64/db_trace.c
@@ -88,13 +88,15 @@ db_stack_trace_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count, char *m
 		nargs = sof - sol;
 		if (nargs > 8)
 			nargs = 8;
-		for (i = 0; i < nargs; i++) {
-			p = ia64_rse_register_address(bsp, 32 + i);
-			db_read_bytes((vm_offset_t) p, sizeof(reg),
-				      (caddr_t) &reg);
-			if (i > 0)
-				db_printf(", ");
-			db_printf("0x%lx", reg);
+		if (bsp >= IA64_RR_BASE(5)) {
+			for (i = 0; i < nargs; i++) {
+				p = ia64_rse_register_address(bsp, 32 + i);
+				db_read_bytes((vm_offset_t) p, sizeof(reg),
+					      (caddr_t) &reg);
+				if (i > 0)
+					db_printf(", ");
+				db_printf("0x%lx", reg);
+			}
 		}
 		db_printf(") at ");