diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 9c84ed75..7435794d 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -213,7 +213,6 @@ else()
 
     # Set C++20
     target_compile_features(${PROJECT_TARGET_LIB} PUBLIC cxx_std_20)
-    set_target_properties(${PROJECT_TARGET_LIB} PROPERTIES CXX_EXTENSIONS OFF)
     # Set C99
     target_compile_features(${PROJECT_TARGET_LIB} PUBLIC c_std_99)
 
diff --git a/tst/CMakeLists.txt b/tst/CMakeLists.txt
index cd56fc1d..f3ec691e 100644
--- a/tst/CMakeLists.txt
+++ b/tst/CMakeLists.txt
@@ -15,16 +15,22 @@ get_property(CMARK_BINARY_DIR GLOBAL PROPERTY COMMONMARKER_BINARY_DIR)
 enable_testing()
 
 add_executable(draw draw_test.cc mock-middleware.h)
+target_compile_features(draw PUBLIC cxx_std_20)
+set_target_properties(draw PROPERTIES CXX_EXTENSIONS OFF)
 target_include_directories(draw PRIVATE ${CMAKE_SOURCE_DIR}/src ${CMARK_BINARY_DIR} ${GTKMM_INCLUDE_DIRS})
 target_link_libraries(draw PRIVATE libreweb-browser-lib-draw ${GTKMM_LIBRARIES} LibCommonMarker gtest_main gmock_main)
 add_test(NAME draw_test COMMAND draw)
 
 add_executable(file file_test.cc)
+target_compile_features(file PUBLIC cxx_std_20)
+set_target_properties(file PROPERTIES CXX_EXTENSIONS OFF)
 target_include_directories(file PRIVATE ${CMAKE_SOURCE_DIR}/src)
 target_link_libraries(file PRIVATE libreweb-browser-lib-file gtest_main)
 add_test(NAME file_test COMMAND file)
 
 add_executable(parser parser_test.cc)
+target_compile_features(parser PUBLIC cxx_std_20)
+set_target_properties(parser PROPERTIES CXX_EXTENSIONS OFF)
 target_include_directories(parser PRIVATE ${CMAKE_SOURCE_DIR}/src ${CMARK_BINARY_DIR}  ${GTKMM_INCLUDE_DIRS})
 target_link_libraries(parser PRIVATE libreweb-browser-lib-parser ${GTKMM_LIBRARIES} LibCommonMarker gtest_main)
 add_test(NAME parser_test COMMAND parser)