diff --git a/build.sh b/build.sh
index 90c3067ed..02477e0b1 100755
--- a/build.sh
+++ b/build.sh
@@ -204,9 +204,8 @@ popd
 mkdir -p build-mac
 pushd build-mac
 cmake   -DNCNN_OPENMP=OFF \
-        -DNCNN_OPENCV=ON \
         -DNCNN_BENCHMARK=ON \
         ..
-make -j 8
+make -j8
 make install
 popd