diff --git a/nemu/tests/expr_test.c b/nemu/tests/expr_test.c
index a3f28d5..2e3b931 100644
--- a/nemu/tests/expr_test.c
+++ b/nemu/tests/expr_test.c
@@ -153,6 +153,7 @@ struct {
 }, reg_exprs[] = {
     {"$ra", 0x1},
     {"0x2 + 4*-$a7", 0xFFFFFFBEU},
+    {"0x1831/$gp + 13", 2077U},
 };
 START_TEST(test_expr_negative_operand) {
   yy_scan_string(exprs[_i].expr);