diff --git a/Tests/Functional/PyStd/CMakeLists.txt b/Tests/Functional/PyStd/CMakeLists.txt
index e3dc3dc912556479a27d945e1864824b79bac1db..c2a55bf6dc44e146227406432f41c0a19754d7bf 100644
--- a/Tests/Functional/PyStd/CMakeLists.txt
+++ b/Tests/Functional/PyStd/CMakeLists.txt
@@ -33,6 +33,6 @@ target_include_directories(${test} PUBLIC
     ${CMAKE_SOURCE_DIR}/ThirdParty/common/gtest/gtest-1.8.0/include)
 target_link_libraries(${test} BornAgainCore gtest)
 
-gtest_discover_tests(${test} DISCOVERY_TIMEOUT 300 TEST_PREFIX Py.)
+gtest_discover_tests(${test} DISCOVERY_TIMEOUT 300 TEST_PREFIX Py. PROPERTIES LABELS "XL")
 
 file(MAKE_DIRECTORY ${TEST_OUTPUT_DIR_PY_STD})