diff --git a/lib/TargetSetup.cmake b/lib/TargetSetup.cmake
index 48541f0..4699e3d 100644
--- a/lib/TargetSetup.cmake
+++ b/lib/TargetSetup.cmake
@@ -36,7 +36,7 @@ function(myx_target_setup NAME)
   endif()
 
   if(ARG_PCH)
-    if(${CMAKE_VERSION} VERSION_GREATER_EQUAL 3.16)
+    if(${CMAKE_VERSION} VERSION_GREATER_EQUAL 3.16 AND PROJECT_IS_TOP_LEVEL OR MYX_USE_LOCAL_DIRECTORIES)
       target_precompile_headers(${NAME} PRIVATE ${ARG_PCH})
     else()
       target_compile_options(${NAME} PRIVATE -include ${ARG_PCH})