diff --git a/nss/coreconf/rules.mk b/nss/coreconf/rules.mk
index dc72e9c..87021c6 100644
--- a/nss/coreconf/rules.mk
+++ b/nss/coreconf/rules.mk
@@ -42,7 +42,7 @@ endif
 
 $(DIRS):
 	$(IGNORE_ERROR)@if [ "$@" != "." ]; then \
-		$(MAKE) -C $@ $(MAKECMDGOALS) ; \
+		$(MAKE) -j$(nproc) -C $@ $(MAKECMDGOALS) ; \
 	else \
 		IGNORE_DIRS=1 $(MAKE) -C $@ $(MAKECMDGOALS) ; \
 	fi