diff --git a/src/core/tests/preprocess.cpp b/src/core/tests/preprocess.cpp
index 4ecb889b943..9c472af835f 100644
--- a/src/core/tests/preprocess.cpp
+++ b/src/core/tests/preprocess.cpp
@@ -1178,25 +1178,25 @@ TEST(pre_post_process, postprocess_convert_layout_invalid_dims_dyn_shape) {
 
 TEST(pre_post_process, postprocess_preserve_rt_info) {
     auto f = create_simple_function(element::f32, Shape{1, 3, 2, 2});
-    f->get_results()[0]->get_rt_info()["someKey"] = ov::make_variant("someValue");
-    f->input().get_rt_info()["someKey_in"] = ov::make_variant("someValue_in");
-    f->output().get_rt_info()["someKey_out"] = ov::make_variant("someValue_out");
+    f->get_results()[0]->get_rt_info()["someKey"] = "someValue";
+    f->input().get_rt_info()["someKey_in"] = "someValue_in";
+    f->output().get_rt_info()["someKey_out"] = "someValue_out";
     auto p = PrePostProcessor(f);
     p.output().tensor().set_element_type(element::u8);
     f = p.build();
     EXPECT_EQ(f->output().get_element_type(), element::u8);
 
     ASSERT_EQ(f->get_results()[0]->get_rt_info().count("someKey"), 1);
-    auto var0 = std::dynamic_pointer_cast<VariantImpl<std::string>>(f->get_results()[0]->get_rt_info()["someKey"]);
-    EXPECT_EQ(var0->get(), "someValue");
+    auto var0 = f->get_results()[0]->get_rt_info()["someKey"].as<std::string>();
+    EXPECT_EQ(var0, "someValue");
 
     ASSERT_EQ(f->input().get_rt_info().count("someKey_in"), 1);
-    auto var0_in = std::dynamic_pointer_cast<VariantImpl<std::string>>(f->input().get_rt_info()["someKey_in"]);
-    EXPECT_EQ(var0_in->get(), "someValue_in");
+    auto var0_in = f->input().get_rt_info()["someKey_in"].as<std::string>();
+    EXPECT_EQ(var0_in, "someValue_in");
 
     ASSERT_EQ(f->output().get_rt_info().count("someKey_out"), 1);
-    auto var0_out = std::dynamic_pointer_cast<VariantImpl<std::string>>(f->output().get_rt_info()["someKey_out"]);
-    EXPECT_EQ(var0_out->get(), "someValue_out");
+    auto var0_out = f->output().get_rt_info()["someKey_out"].as<std::string>();
+    EXPECT_EQ(var0_out, "someValue_out");
 }
 
 TEST(pre_post_process, postprocess_custom_step) {