diff --git a/core/build/linux_kernel/BUILD b/core/build/linux_kernel/BUILD
index e130142..e1f9c9b 100644
--- a/core/build/linux_kernel/BUILD
+++ b/core/build/linux_kernel/BUILD
@@ -20,7 +20,7 @@
     cp $(locations @//core/build/utils) $$DIR/.bin/
     cp $(location initramfs.list) $$DIR/initramfs.list
 
-    (cd $$DIR && make -j 16) >/dev/null
+    (cd $$DIR && make -j $$(nproc)) >/dev/null
 
     cp $$DIR/arch/x86/boot/bzImage $(RULEDIR)
     """,
diff --git a/core/build/utils/BUILD b/core/build/utils/BUILD
index 216ffff..d49359a 100644
--- a/core/build/utils/BUILD
+++ b/core/build/utils/BUILD
@@ -39,7 +39,7 @@
     (
         cd external/musl
         ./configure --prefix=$$MUSL --syslibdir=$$MUSL/lib
-        make -j 8 install
+        make -j $$(nproc) install
     ) > /dev/null
 
     echo "Installing Linux kernel headers..."
@@ -63,7 +63,7 @@
         --disable-makeinstall-chown \
         --disable-makeinstall-setuid \
         --with-bashcompletiondir=$$MUSL/usr/share/bash-completion
-        make -j8 libuuid.la libblkid.la
+        make -j $$(nproc) libuuid.la libblkid.la
         echo "Installing util_linux..."
         cp -v .libs/* $$MUSL/lib/
         mkdir -p $$MUSL/include/{uuid,blkid}