diff --git a/.ci/oss-fuzz.sh b/.ci/oss-fuzz.sh
index 8206f2da8..4ed406e55 100755
--- a/.ci/oss-fuzz.sh
+++ b/.ci/oss-fuzz.sh
@@ -22,6 +22,26 @@ export CMAKE_GENERATOR=Ninja
 
 ln -f -s /usr/local/bin/lld /usr/bin/ld
 
+cd "$SRC"
+
+wget -q https://github.com/llvm/llvm-project/releases/download/llvmorg-16.0.6/llvm-project-16.0.6.src.tar.xz
+tar -xf llvm-project-16.0.6.src.tar.xz llvm-project-16.0.6.src/{runtimes,cmake,llvm/cmake,libcxx,libcxxabi}/
+LIBCXX_BUILD="$SRC/llvm-project-16.0.6.build"
+mkdir "$LIBCXX_BUILD"
+cmake -S llvm-project-16.0.6.src/runtimes/ -B "$LIBCXX_BUILD" \
+      -DCMAKE_BUILD_TYPE=Release \
+      -DBUILD_SHARED_LIBS=OFF \
+      -DLLVM_INCLUDE_TESTS=OFF \
+      -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" \
+      -DLIBCXX_ENABLE_SHARED=OFF \
+      -DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=ON \
+      -DLIBCXXABI_ENABLE_SHARED=OFF \
+      -DLIBCXX_INCLUDE_BENCHMARKS=OFF \
+      -DLIBCXXABI_ADDITIONAL_COMPILE_FLAGS="-fno-sanitize=vptr"
+cmake --build "$LIBCXX_BUILD" -- -j$(nproc) cxx cxxabi
+
+CXXFLAGS="$CXXFLAGS -nostdinc++ -nostdlib++ -isystem $LIBCXX_BUILD/include -isystem $LIBCXX_BUILD/include/c++/v1 -L$LIBCXX_BUILD/lib -lc++ -lc++abi"
+
 if [[ $SANITIZER = *undefined* ]]; then
   CFLAGS="$CFLAGS -fsanitize=unsigned-integer-overflow -fno-sanitize-recover=unsigned-integer-overflow"
   CXXFLAGS="$CXXFLAGS -fsanitize=unsigned-integer-overflow -fno-sanitize-recover=unsigned-integer-overflow"