diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index afe4fbb..621fc80 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -22,10 +22,12 @@ target_link_libraries(${PROJECT_NAME}-tests-17 PRIVATE Catch2::Catch2WithMain ${
 catch_discover_tests(${PROJECT_NAME}-tests-17)
 
 # add c++20 tests
+add_executable(${PROJECT_NAME}-tests-20 ${TEST_SRC})
 if(SEMVER_BUILD_MODULE)
-    list(APPEND TEST_SRC module/module_tests.cpp)
+    target_sources(${PROJECT_NAME}-tests-20 PRIVATE module/module_tests.cpp)
+    set_target_properties(${PROJECT_NAME}-tests-20 PROPERTIES CXX_SCAN_FOR_MODULES ON)
+    set_target_properties(${PROJECT_NAME}-tests-20 PROPERTIES CXX_EXTENSIONS OFF)
 endif()
-add_executable(${PROJECT_NAME}-tests-20 ${TEST_SRC})
 set_target_properties(${PROJECT_NAME}-tests-20 PROPERTIES CXX_STANDARD 20)
 target_link_libraries(${PROJECT_NAME}-tests-20 PRIVATE Catch2::Catch2WithMain ${PROJECT_NAME})
 catch_discover_tests(${PROJECT_NAME}-tests-20)
\ No newline at end of file