Index: Mk/Uses/ninja.mk
===================================================================
--- Mk/Uses/ninja.mk	(revision 383565)
+++ Mk/Uses/ninja.mk	(working copy)
@@ -27,6 +27,7 @@
 MAKEFILE=
 MAKE_CMD=	ninja
 MAKE_FLAGS=
+_MAKE_JOBS=	-j${MAKE_JOBS_NUMBER}	# Use -j1 for MAKE_JOBS_NUMBER=1 too
 _DESTDIR_VIA_ENV=	yes
 
 .endif
Index: Mk/bsd.port.mk
===================================================================
--- Mk/bsd.port.mk	(revision 383565)
+++ Mk/bsd.port.mk	(working copy)
@@ -2047,7 +2047,7 @@
 
 # Multiple make jobs support
 .if defined(DISABLE_MAKE_JOBS) || defined(MAKE_JOBS_UNSAFE)
-_MAKE_JOBS=		#
+_MAKE_JOBS?=		#
 MAKE_JOBS_NUMBER=	1
 .else
 .if defined(MAKE_JOBS_NUMBER)