diff --git a/src/core/include/megbrain/utils/metahelper.h b/src/core/include/megbrain/utils/metahelper.h
index b9909b149974efee4b51b609c8383938c0a792bc..b44d528820864af8442f46b1ec26912de0f38101 100644
--- a/src/core/include/megbrain/utils/metahelper.h
+++ b/src/core/include/megbrain/utils/metahelper.h
@@ -122,7 +122,7 @@ class DynTypeObj {
 //! get class name from class object
 #define _MGB_TYPEINFO_CLASS_NAME(_cls) #_cls
 #else
-#define _MGB_TYPEINFO_CLASS_NAME(_cls) nullptr
+#define _MGB_TYPEINFO_CLASS_NAME(_cls) ""
 #endif
 
 //! put in the impl file of a class that needs static typeinfo()
diff --git a/src/plugin/test/opr_io_dump.cpp b/src/plugin/test/opr_io_dump.cpp
index 78d65e68458b4d24ee9b05f5e2cb3e4f2e228ab9..3b05ceb67f2a8673080f027369e1204e5fcbcc88 100644
--- a/src/plugin/test/opr_io_dump.cpp
+++ b/src/plugin/test/opr_io_dump.cpp
@@ -147,7 +147,7 @@ std::vector<std::string> getlines(std::istream& inp, size_t skip_head = 0) {
 }
 
 }  // anonymous namespace
-
+#if MGB_VERBOSE_TYPEINFO_NAME
 TEST(TestOprIODump, Text) {
     auto fname_base = output_file("test_opr_iodump");
     std::array<std::string, 3> fnames;
@@ -180,8 +180,10 @@ TEST(TestOprIODump, Text) {
 
     run_test(make_plugin, check_result);
 }
+#endif
 
 TEST(TestOprIODump, StdErr) {
+    MGB_MARK_USED_VAR(EXPECTED_TEXT_OUT_REC);
     HostTensorGenerator<> gen;
     auto host_x = gen({5});
     auto host_y = gen({5});