diff --git a/build.sh b/build.sh
index 2b4c356..08b9eda 100755
--- a/build.sh
+++ b/build.sh
@@ -7,7 +7,7 @@ source util.sh
 cd build
 
 # Number of processor cores
-if [[ $(uname) == "OpenBSD" ]]; then
+if [[ $(uname) == "OpenBSD" || $(uname) == "Darwin" ]]; then
   cores=$(sysctl -n hw.ncpu)
 else
   cores=$(nproc)