diff --git a/Makefile.inc1 b/Makefile.inc1
index 84018785333d..71b6db35a501 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -2576,8 +2576,8 @@ check-old: check-old-files check-old-libs check-old-dirs .PHONY
 # showconfig - show build configuration.
 #
 showconfig: .PHONY
-	@(${MAKE} -n -f ${.CURDIR}/sys/conf/kern.opts.mk -V dummy -dg1; \
-	  ${MAKE} -n -f ${.CURDIR}/share/mk/src.opts.mk -V dummy -dg1) 2>&1 | grep ^MK_ | sort -u
+	@(${MAKE} -n -f ${.CURDIR}/sys/conf/kern.opts.mk -V dummy -dg1 UPDATE_DEPENDFILE=no NO_OBJ=yes; \
+	  ${MAKE} -n -f ${.CURDIR}/share/mk/src.opts.mk -V dummy -dg1 UPDATE_DEPENDFILE=no NO_OBJ=yes) 2>&1 | grep ^MK_ | sort -u
 
 .if !empty(KRNLOBJDIR) && !empty(KERNCONF)
 DTBOUTPUTPATH= ${KRNLOBJDIR}/${KERNCONF}/