diff --git a/scripts/setup-macos.sh b/scripts/setup-macos.sh
index da1f73d8a8a1..76d7fe606fd8 100755
--- a/scripts/setup-macos.sh
+++ b/scripts/setup-macos.sh
@@ -104,7 +104,7 @@ function install_boost {
   (
     cd ${DEPENDENCY_DIR}/boost
     ./bootstrap.sh --prefix=${INSTALL_PREFIX}
-    ${SUDO} ./b2 "-j$(nproc)" -d0 install threading=multi --without-python
+    ${SUDO} ./b2 "-j${NPROC}" -d0 install threading=multi --without-python
   )
 }