diff --git a/scripts/build/p-libcxx.inc b/scripts/build/p-libcxx.inc
index 27fe4a614c..3ee4166092 100644
--- a/scripts/build/p-libcxx.inc
+++ b/scripts/build/p-libcxx.inc
@@ -53,7 +53,7 @@ build_libcxx() {
     export LLVM_COMPILER_PATH="$(dirname "${BITCODE_CC}")"
 
     cmake "${cmake_flags[@]}" "${LIBCXX_SRC}/llvm"
-    make cxx
+    make cxx -j$(nproc) || make cxx
   )
 }