diff --git a/CMakeLists.txt b/CMakeLists.txt
index ba94fcee..75847202 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -112,8 +112,10 @@ add_library(Vec::Vec INTERFACE IMPORTED)
 target_include_directories(Vec::Vec INTERFACE "${CMAKE_SOURCE_DIR}/3rdparty/vec")
 
 set(lego1_targets)
+set(lego1_interface_targets)
 macro(add_lego1_static_library NAME)
   list(APPEND lego1_targets ${NAME})
+  list(APPEND lego1_interface_targets ${NAME}-interface)
   add_library(${NAME}-interface INTERFACE)
   add_library(${NAME}-objects STATIC ${ARGN})
   target_link_libraries(${NAME}-objects PRIVATE ${NAME}-interface)
@@ -504,7 +506,7 @@ endif()
 
 if (MSVC)
   if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "15")
-    set_property(TARGET ${lego1_targets} APPEND PROPERTY COMPILE_DEFINITIONS "_CRT_SECURE_NO_WARNINGS")
+    set_property(TARGET ${lego1_interface_targets} APPEND PROPERTY INTERFACE_COMPILE_DEFINITIONS "_CRT_SECURE_NO_WARNINGS")
     if (TARGET isle)
       target_compile_definitions(isle PRIVATE "_CRT_SECURE_NO_WARNINGS")
     endif()
@@ -514,7 +516,7 @@ if (MSVC)
   endif()
   # Visual Studio 2017 version 15.7 needs "/Zc:__cplusplus" for __cplusplus
   if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "19.14.26428")
-    foreach(tgt IN LISTS lego1_targets)
+    foreach(tgt IN LISTS lego1_interface_targets)
       target_compile_options(${tgt} PRIVATE "-Zc:__cplusplus")
     endforeach()
     if (TARGET isle)