diff --git a/nemu/tests/expr_test.c b/nemu/tests/expr_test.c
index 038294a..1af2fa9 100644
--- a/nemu/tests/expr_test.c
+++ b/nemu/tests/expr_test.c
@@ -173,7 +173,6 @@ START_TEST(test_expr_plain_register) {
   buf[0] = '$';
   for (i = 0; i < 32; i++) {
     ck_assert(strcpy(buf + 1, regs[i]));
-    fputs(buf, stderr);
     gpr(i) = i;
   }