diff --git a/stand/i386/loader/Makefile b/stand/i386/loader/Makefile
index cde1513aac06..8b027b2edd61 100644
--- a/stand/i386/loader/Makefile
+++ b/stand/i386/loader/Makefile
@@ -19,7 +19,7 @@ PROG=		${LOADER}.sym
 INTERNALPROG=
 NEWVERSWHAT?=	"bootstrap loader" x86
 VERSION_FILE=	${.CURDIR}/../loader/version
-LOADERSIZE=	510000		# Largest known safe size
+LOADERSIZE?=	510000		# Largest known safe size
 
 
 .PATH:		${BOOTSRC}/i386/loader
diff --git a/stand/i386/pxeldr/Makefile b/stand/i386/pxeldr/Makefile
index f8bc1eae9a31..3d27285968ce 100644
--- a/stand/i386/pxeldr/Makefile
+++ b/stand/i386/pxeldr/Makefile
@@ -13,7 +13,7 @@ BOOT=	pxeboot
 LDR=	pxeldr
 ORG=	0x7c00
 LOADER=	loader
-PXELDRSIZE= 510000		# Largest known safe size
+PXELDRSIZE?= 510000		# Largest known safe size
 
 .if defined(BOOT_PXELDR_PROBE_KEYBOARD)
 CFLAGS+=-DPROBE_KEYBOARD