diff --git a/tools/build_steps_win_arm64.bat b/tools/build_steps_win_arm64.bat
index 808e04d..5da4153 100755
--- a/tools/build_steps_win_arm64.bat
+++ b/tools/build_steps_win_arm64.bat
@@ -93,8 +93,11 @@ echo Setting up ARM64 Developer Command Prompt and running CMake...
 :: Initialize VS ARM64 environment
 for /f "usebackq tokens=*" %%i in (`"C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe" -latest -property installationPath`) do call "%%i\VC\Auxiliary\Build\vcvarsall.bat" arm64
  
+:: Prefer LLVM flang
+PATH=C:\Program Files\LLVM\bin;%PATH%
+
 :: Run CMake and Ninja build
-cmake .. -G Ninja -DCMAKE_BUILD_TYPE=Release -DTARGET=ARMV8 -DBUILD_SHARED_LIBS=ON -DARCH=arm64 ^
+cmake .. -G Ninja -DCMAKE_BUILD_TYPE=Release -DUSE_THREADS=1 -DNUM_THREADS=24 -DTARGET=ARMV8 -DBUILD_SHARED_LIBS=ON -DARCH=arm64 ^
 -DBINARY=%build_bits% -DCMAKE_SYSTEM_PROCESSOR=ARM64 -DCMAKE_C_COMPILER=clang-cl ^
 -DCMAKE_Fortran_COMPILER=flang-new -DSYMBOLPREFIX="scipy_" -DLIBNAMEPREFIX="scipy_" %interface_flags%
 if errorlevel 1 exit /b 1