diff --git a/libports/Makefile b/libports/Makefile
index fce83778da..cc5aa7f504 100644
--- a/libports/Makefile
+++ b/libports/Makefile
@@ -74,3 +74,5 @@ clean: $(addprefix clean-,$(PKG))
 
 cleanall: clean
 	$(VERBOSE)rm -rf $(DOWNLOAD_DIR)
+
+.NOTPARALLEL:
diff --git a/ports/Makefile b/ports/Makefile
index ae09696f7c..12262963bb 100644
--- a/ports/Makefile
+++ b/ports/Makefile
@@ -79,3 +79,4 @@ clean::
 cleanall: clean
 	$(VERBOSE)rm -rf $(DOWNLOAD_DIR)
 
+.NOTPARALLEL: