diff --git a/build-mac.sh b/build-mac.sh
old mode 100644
new mode 100755
index 0856393caa56..9e83cd235497
--- a/build-mac.sh
+++ b/build-mac.sh
@@ -24,5 +24,5 @@ fi
 mkdir -p build
 pushd build
 cmake ${CMAKE_FLAGS} ..
-cmake --build . --target dolphin-emu -- -j$(nproc)
+cmake --build . --target dolphin-emu -- -j$(sysctl -n hw.ncpu)
 popd