diff --git a/source/tests/mars-test/mars_core_state.cpp b/source/tests/mars-test/mars_core_state.cpp
index e457400..1fd9938 100644
--- a/source/tests/mars-test/mars_core_state.cpp
+++ b/source/tests/mars-test/mars_core_state.cpp
@@ -22,7 +22,7 @@ class mars_core_state_test : public testing::Test
 
 TEST_F(mars_core_state_test, CTOR_CORE_TYPE)
 {
-  mars::CoreType core_type();
+  mars::CoreType core_type;
 }
 
 TEST_F(mars_core_state_test, CTOR_CORE_STATE_TYPE)