diff --git a/build-mac.sh b/build-mac.sh
index 4f4eb3b551..0b67f32a51 100644
--- a/build-mac.sh
+++ b/build-mac.sh
@@ -21,7 +21,7 @@ fi
 mkdir -p build
 pushd build
 cmake ${CMAKE_FLAGS} ..
-make -j7
+make -j$(sysctl -n hw.ncpu)
 popd
 
 # Copy the Sys folder in