diff --git a/compile_min_simd.sh b/compile_min_simd.sh
index d11f0712a..9c8659d66 100644
--- a/compile_min_simd.sh
+++ b/compile_min_simd.sh
@@ -60,7 +60,7 @@ else
   echo "configuring for 64 bit release"
   echo
 # You may add  --enable-adms to the following command for adding adms generated devices 
-  ../configure --with-wingui --enable-xspice --enable-cider --enable-openmp --disable-debug --enable-modsimd prefix="C:/Spice64" CFLAGS="-m64 -O3 -mtune=native " LDFLAGS="-m64 -s"
+  ../configure --with-wingui --enable-xspice --enable-cider --enable-openmp --disable-debug --enable-modsimd prefix="C:/Spice64" CFLAGS="-m64 -O3 -march=native " LDFLAGS="-m64 -s"
 fi
 if [ $? -ne 0 ]; then  echo "../configure failed"; exit 1 ; fi