diff --git a/cmake/wasi-sdk-sysroot.cmake b/cmake/wasi-sdk-sysroot.cmake
index 576327f..127ca62 100644
--- a/cmake/wasi-sdk-sysroot.cmake
+++ b/cmake/wasi-sdk-sysroot.cmake
@@ -262,6 +262,8 @@ function(define_libcxx_sub target target_suffix extra_target_flags extra_libdir_
       -DCMAKE_CXX_FLAGS=${extra_cxxflags}
       -DLIBCXX_LIBDIR_SUFFIX=/${target}${extra_libdir_suffix}
       -DLIBCXXABI_LIBDIR_SUFFIX=/${target}${extra_libdir_suffix}
+      -DLIBCXX_INCLUDE_TESTS=OFF
+      -DLIBCXX_INCLUDE_BENCHMARKS=OFF
 
     # See https://www.scivision.dev/cmake-externalproject-list-arguments/ for
     # why this is in `CMAKE_CACHE_ARGS` instead of above