diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1a5ec44..216229f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,8 +1,5 @@
 cmake_minimum_required(VERSION 4.2 FATAL_ERROR)
 
-# workaround clang bug
-set(CMAKE_CXX_STDLIB_MODULES_JSON "/usr/lib/llvm-21/lib/libc++.modules.json")
-
 include("${CMAKE_CURRENT_LIST_DIR}/cmake/cpprog.cmake")
 
 cpprog_init()
diff --git a/CMakePresets.json b/CMakePresets.json
index 5d883c6..c39a50d 100644
--- a/CMakePresets.json
+++ b/CMakePresets.json
@@ -21,6 +21,7 @@
             "hidden": true,
             "inherits": "vcpkg",
             "cacheVariables": {
+                "CMAKE_CXX_STDLIB_MODULES_JSON": "/usr/lib/llvm-21/lib/libc++.modules.json",
                 "VCPKG_TARGET_TRIPLET": "x64-linux-clang-libcxx",
                 "VCPKG_CHAINLOAD_TOOLCHAIN_FILE": "${sourceDir}/cmake/x64-linux-clang-libcxx.toolchain.cmake"
             }